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There are a ton of post on adding shoulder belts, use Google to find them. I am only familiar with the 73 year which requires seat removal, pull down of top of seat back covering, and replacement/addition of metal bezel. Also may require internal bracket mounted to seat back. Look at vendor catalogs along with the AIM for your a 1975 car which should will give parts list and illustration.
How difficult is it to add period shoulder belts for a 1975 Convertible? The seats are vinyl and no hole for the shoulder belt to go through.
I'm not sure the slot was limited to the custom leather interior, but used for either interior option. Having said that, I've attached a couple of pages from the NCRS about to be published judging guide and the section on seat belts. You'll see some other requirements for the original installation, which differs from the lap/shoulder seat belt assembly used for coupes. This should provide some background as you consider either option.
I used two plastic cable ties to pull plastic/rubber web stop through the seat brackets. Also read where other guys have used a hair dryer to warm web stop to make it easier to pull through. Pulling the web stop through the seat is the easiest part of the job, pulling down the seat cover and then attaching the metal bezel is the hard part.
You need to have the vinyl end pieces removed from the seat belts to get them thru that hole in the seal. Soooo, you boil a big mug of water and stick the end of the seat belt (with the vinyl end on it) in the water for about 30 seconds. Then, with a gloved hand, you grab the vinyl piece and 'walk' it off the end of the belt.
Guess what? When you want to put it back on the end of the belt.....yeah, boil some water.
Interesting that none of the seat cover installation videos I could find cover the shoulder belt removal. They are just magically removed. Thanks for the tip
I've wondered how that vinyl boot got put on at the assembly factory?? I'm sure the boot and belt came to the factory as separate items. Maybe 'new' boots were soft enough that they could be pulled over the metal tongue. I know that 40 year-old boots are pretty stiff (and would likely tear if forced over the tongue).
Not sure about everyone else, but I used two cable ties (connected together for longer length) and just pulled them through the seat / bezel. I guess the Bubba in me sometimes comes out. Had to do it latter on when installing new carpet.
Dipping the boot in boiling water worked great, it just slipped off. I agree, the 40 year old boots are pretty stiff and would likely tear, but the hot water did the trick.