My carpet replacement snowballed into floorpan replacement. My 69 442 convertible originally came with a bench seat, somewhere along the line it was replaced by a different GM bucket seat (pics below). I am wondering if the bolt locations are the same for every seat? If I line up the bolt holes and weld in nuts, will they still be in the right spot when I finally can afford Olds seats?

Thanks,
Bob

 

I don't know for certain about your '69. However, my first '68 Cutlass S came with a bench seat. I went to the local junkyard, told the guy I wanted buckets in white. He sold me a pair of '68 BUICK buckets and they bolted right in without any real work to speak of.

 

Ignoring the variations in seatback release buttons and headrests, all bucket seat frames used on the 1966-1972 A-body, B-body, and E-body cars are the same. The threaded holes in the seat base that the tracks bolt to are the same for all of them. The seat tracks themselves, however, are unique to the different car lines (A, B, and E bodies all use different tracks).

 

You'll also need the the brackets that spot-weld to the floor for the inner bucket seat tracks. Both the inner floor brackets & repop bucket seat tracks are readily available.

 

Those are 68 GTO seats, which are fairly desireable as they are a 1 year only seat design.All GM "strato buckets" can interchange covers- which means if you want these to have correct 69 covers for your car, they will install just fine and look right.
The side release button is "incorrect" for 69, it was unique to 67 & 68, however i prefer the design, so unless you are adamant about being 100% correct on every detail, i would just buy 69 covers and there you go.
If you need to be 100% correct, should be no big deal to sell these to someone wanting 68 specific seats, and buy a set of 69-72 seats with the "center of the back release button", 69-72 years are all the same guts, again just get the 69 Covers and install. No need to find "Oldsmobile" seats as cores. Recover and make them into Oldsmobile seats.

Regarding bolting them in, as mentioned above, you will need the bucket seat floor mounting brackets. those get welded to the floor pan. The only "factory" hole in the floor that gets used is in the rear outside. There are 2 holes in the floor pan here, both with nuts welded on the underside of the pan support brace.

for bucket seats, use the INBOARD hole in the floor, and the OUTBOARD hole in the rear track foot.
Once you have that as the pivot point, you just line up the seat tracks with the floor brackets bolted to them to make the seat straight and tack the brackets to the floor.

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That is exactly what I needed to know! Thank you! Everything else I have read all makes sense now.

Bob