Are you looking for a 50/50 split bench seat?
 

After weeks of searching for a 50/50 split bench seat for our 1966 BelevedereII, I finally located one in very good condition. Of course it needed reupholstering and a couple of springs but other than that the frame was in excellent condition. When I located the seat they had 5 of them at that time. I found it at Freeman's Auto in Whitehall, Montana and the phone number is 406-287-9103. Fax is 406-287-5436 email is freemansauto@bigplanet.com.
Please allow for pick time and shipping as it can take 2-4 months.
They have other Mopar parts as well so if you are stuck in finding a part, you may want to give them a call or fax or email. It never hurts!