In talking with Gernold at SL TEch 113 in Me, He informed me that there is a small plate along the left fender (in front of the brake booster)
it has about 3 lines of numbers. In the last line of numbers, at the end (Towards the Windshield) the last three numbers are used on parts thruout the car.
If you have different numbers on some parts then somebody has changed parts.
As to Mounts, engine and transmission etc . if you are in there always change them.
Tom M