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Phil, while you there, do you self a favor and change damper plate for after market from catalina direct (Trust me on that one!) and maybe, rear oil seal.
Also , would not hurt to change oil pressure sensor, and check/service starter.
sooo much easier when engine is out. Did those things last summer for peace of mind, while was changing motor mounts for vetus 75, all 4 (cause M35)

another one

Never had a problem with SS outfitters, I have Tohatsu 9.8 4 stroke .
Bracket is located on flat portion of transom, 8 years and running good!

Your welder is correct. Position plates in desired location, tape it, position clutches, you have to play for best angles, mark clutches holes location, see where you can position plates mounting holes.
I have used four, 5/16 SS flat head bolts, countersink them flush with plates, under clutches, so they are not visible. If memory serves me well, I was able to use two or three existing holes, just enlarged them, cause they were 1/4" and slightly corroded, hence 5/16. Yes, aluminum plate inside, not sure of size thou... 1/4" for sure.

Also, make sure that shutdown T bar is pushed down fully, I was scratching my head for hours, why engine doesn't start....lesson learned.

 Very good  condition starboard water tank original.
Changed for smaller one. Toronto Canada
Can ship, tank is free, shipping is not.

LOGO, what will be your projected capacity ?

Another thing to consider: found this on Vetus website under installation instructions,

Flexible engine mounting assembly
It is important that an equal load is applied to the left and the right flexible mounting at the front section of the engine; and the same goes for the
engine's rear section: equal load to the left and the right support. It is admissible - and often unavoidable - that a different load is applied to the front and
rear flexible engine mountings.
A proper adjustment of the engine supports can be assured by the following
procedure:
- Provide for an approximate alignment of engine and shaft assembly, by
means of the nuts on the support spindle, but do NOT connect the propeller shaft yet to the gearbox flange.
- Lift the front part of the engine slightly, up to the point that both front
engine feet become free of the lower nuts of the flexible supports.
- Lower the engine, while adjusting the nuts in such a way that both engine
feet touch the nuts simultaneously.
- Repeat the foregoing with the rear section of the engine.
After the proper adjustment of the flexible engine supports, the precise alignment can be obtained by turning the nuts of the rear and front supports, both
left and right, by exactly the same number of turns.
It is imperative that the flexible engine mountings will be installed free of pretorsion alongships, as this would transmit vibrations and noise to the boat.
The slot in the baseplate of the flexible supports allow for installation corrections sideways.
Verify the proper alignment anew, when the boat has been launched.
For a proper flexible mounting assembly of the ship engine, the following
criteria must be satisfied:
- the rubber engine mountings should be at least pushed in a minimum
amount as a result of the static load *, and
- the rubber engine mountings should be pushed in no more than the
maximum amount as a result of the sum of the static and dynamic load *.
See table and diagram.
* Static load: the load caused by the weight of the engine itself.
Dynamic load: the load caused by the torque of the engine.

here you go
https://www.dropbox.com/s/89osyh63ohlwzw5/IMG_0818%5B1%5D.JPG?dl=0
https://www.dropbox.com/s/jsy29uo6bu85txk/IMG_0819%5B1%5D%20%281%29.jpg?dl=0
https://www.dropbox.com/s/ib9oxbxrvsd0o2c/IMG_0821%5B1%5D%20%281%29.JPG?dl=0
https://www.dropbox.com/s/bqv0u9anm69wupo/IMG_0822%5B1%5D%20%281%29.JPG?dl=0

Sorry, that was my closest photo and since I have done this about six years ago,
I don't recall that detail, however, going to boat on Monday and can take few pictures then.

I used 1/2" aluminum polished,

Does anybody know how bed/stringer holding engine mounts is constructed, build?
Is it hollow, with wood core epoxied inside? or is other method used.

Noah
FYI and others https://ab-marine.com/lasdrop-shaft-seals/

Based on your description, do yourself a favor, change those engine mounts, period.! You will know that at least eliminated one of of vibration causes.
Proper alignment cannot be done on old stiff/worn-out rubber.

2nd question: did you "true" split coupler ?
3rd question how old are engine mounts ?