Hey Clint, my boat does not have the OEM seat as well. A previous owner replaced it some point down the line with what I think is a Sea Ray seat. Super comfortable, tight fit but it still fits though mine does not have a flip up bolster part. Think I have a few pictures of it...lemme check.
Here's the best I got for now, I might head up to take the boat out this weekend but for sure it will be coming out next weekend and I will see if I can snap some pics if you're still curious and looking.
'86 Comp TS6M - Reborn 2016
Riding a HO Sports CX Ski