You are wrong. These seats are a BOLT IN, as I said in the earlier post. I had them in my 67 for yrs. So before you speak, you better know what your saying.
The seats changed mounting later in life. The seats got narrower as time went on. The adjusting slots are on the outside (Toward the doors). The 72/73 seats were on the inboard side, so that's why they go in opposite sides. I had to make brackets for the 84 911 seats to fit, and run power to them for the power adjustments. Funny though, the rears are a perfect fit.. lol Here are the 72/73 seats in the car.
I told 72002 to make me an offer. I also have a full set of used black carpet, a console from an 84 911, some 84 door panel stuff, and a bunch more odd ball stuff.