Thanks raymr, sounds like just using just the parts of the replcmnt seat to put in my original seat is the best way.
--3 more Q's
1. If springs need to be replaced, does anyone ever take off the springs from the jnkyd seat and put them on another?

2. Who should I have do this job, an auto upholstery shop or a good indy MB garage?

3. Any good tricks to get my seatback shell off? It's never been removed (1986-2005), and feels like it's practically glued in.