The seat is a Corbin and Gentry. It's hard to see in this pic, but it's got a stitched logo on the back. It's not a stock pan, cause it's got mounts in several places for different years and hinges. Definitely big and overstuffed. This one was in awesome shape. You can find them on eBay occasionally and they don't bring much (maybe $25-$50) but shipping is a bit rough cause it's so big. Oh, and you can't use the grab bar with it cause it's a bit longer than a stock seat pan.
I just realized those two pics are old. I also put Triple-A floorboards on it (see pic below, really comfy). The bags were a vintage set. I forget the maker, think it said something like "cerutti" or something on a tag but when i painted them gold I removed the emblems. They're black wrinkle plastic with removable paintable panels on the sides. I'm not certain they were actually for a SOHC cause I had to make my own bracket for one part of the mounting.