Thanks for the heads up on the seat base while using some aftermarket seats from another thread. I have seen it done both ways in various other models and configurations.

My question is: Will we have to remove the original (existing) seat base in total before we install replacement (Buick) seats? Or would we install the replacement seats on to of the existing base?

Our seat base got welded in at some point, and I don't want to start cutting if I don't have to.