Shamrock's winter cover looks much like that. I've been looking for a new winter cover. My cover, purchased by PO, is near 20 years old. The fabric is tired, a couple of years ago we, Erie, had a lot of snow and the cover tore in the spring. Repaired with Gorilla Tape, that was 3 seasons ago still OK. Amazing stuff. The company that originally made the cover no longer services the Erie area.
By your hull number think you have a MKll. If that's the case you don't need or want a side door. Just enter from the stern. I take the swim ladder home, it makes it easy to enter with a small ladder.
I hope to find a nice winter cover from someone who has moved south.
Jim