Posted 02 April 2016 - 05:16 PM
My early-74 2-seater has a simple basic little black plastic 'J' hook on each B pillar, just below the window, to hang the seatbelt tang on. It's secured using one of the interior trim screws.
I've had my car from the time it was 10 yrs old so I can only presume that's original, the rest of the interior is, complete with the original fixed seatbelts (no inertia) which are lap belts with a clip-on shoulder belt at the buckle. You hang the two connected portions on the little J hook, whereas the inboard free end just lays in the console tray or falls down the side of the seat. Couldn't be more basic.
I could take a photo but don't know how to post it on here. Easier to send it direct to you.
Hope that helps.