Cotton, I have no idea what that seat is for, but it's not for an 82 185s. I had an 82 seat on my 185s, but it went with a deal for a suspension frame 185s. I have a hi-flite desert seat on my 185s now. I can't remember if the seat base was plastic or not. Even the early 185s seat should fit your trike. You will have to do some searching. I don't remember if I sent trizilla pics of the stock seat or not. Maybe if you look at his thread for his suspension 185s that he got from me that you might see the seat pictures, I can't remember for sure though. That probably helped, but didn't help. Sorry.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90