Try the big catalogs...
MidAmerica
Ecklers
Corvette Central
Vanacor
Zips
The Last Detail
...just to name a few. They can be checked out here at CAC in Supporting Vendors or The Portal.
I want a rear spolier for my 78, but I dislike the popular '78 Pace Car spoiler. This spoiler is a solid piece and makes contact along the entire back deck, wraps the sides a bit to angle up and slightly towards the rear.
I think the spoiler I do like is from an '82 Collector vette. It is flat, with turned down ends and two support pillars that mount to the body.
Heidi