Not a mechanical upgrade, but an upgrade nonetheless. When I took receipt of my GP, the original book and warranty pamphlet were in the glovebox. The warranty stamp card was still there and legible so I was able to do some research and track down the family of the original owners. And just recently I have completed the history of my car from build to present.  May not be much, but it's quite satisfying to have research pay off with results. I was even able to have the window sticker reproduced.

Very cool! It's sometimes the little things that bring the most joy. Love seeing all the old options.

The back-up lights as an option amused me.  They are a big part of the design in the rear but we're an option. I guess they just crammed a chrome plate in there if unequipped.