I just learned something very exciting. Seats from a 1998 Riviera bolt directly to power seat bases from 1973. It seems mother GM hasn't changed the way seats are attached to bases even though the way the bases attach to the car change drastically. It will take some research to find out what seats will bolt up to what bases but I bet a wide range of GM seats will bolt to a lot of the bases. My seats have 6 holes, 4 have nuts welded in, 2 are blank. The 4 with nuts are used for 1998 but the spare 2 holes line up perfectly with the 1973 bases. There's room to slip a nut in so it's a true bolt in deal. The variety of holes indicates these seats fit a number of bases. The only problem is the wiring for the seats and bases is significantly different. I've started a thread in Sparky's corner to get some help on connecting the 2. http://www.v8buick.com/showthread.php?p=991987#post991987 The 1998 seats have 3 motors, 1 each for front up/down, back up/down and foward/backward. The bases have 1 motor and 3 wires that control a transmission. The motor spins forward or reverse and the transmission decides what moves. Here's the puzzle: Switch: Grey -------> Base: Green, White Switch: Tan -------> Base: Light Blue, White Switch: Yellow -------> Base: Tan, White Switch: White -------> Base: Green, Blue Switch:Light Green ---> Base: Light Blue, Blue Switch: Light Blue ---> Base: Tan, Blue You can't wire it up directly because Grey, Tan and Yellow all have to connect to the white wire, but they cannot connect with each other. The same is true for White, Light Green and Light Blue. They have to connect to the Blue wire but not each other. I'm sure one of our electrical experts can sketch out a wiring diagram. After the wiring is sorted it's a completely bolt in proposition and easily reversible. p John
