Seatbelt locking problem

[HotRodScottsdale]

Alright so my 76 Scottsdale passenger seatbelt seems to have a problem of locking and not unlocking till its retracted all the way back and it happens every time I turn, give it gas or slight braking.the drivers side doesn't do it at al unless I hit the brakes or hit a bump. I thought of replacing it but the set up I have is way more different then all the trucks I see in the junk yard, all the ones I seen had both pieces of the belt joining to one piece and the one I have has two pieces , it starts on the floor with a retractor and the metal clip piece on the fabric belt that you can pull across your lap but then the part that covers your chest go's to a clip on the back panel and then the belt go's too a second retractor about shoulder height on the back panel. The bottom one is the one that keeps locking the top one is fine and I don't want to replace it with something different looking.I will try to post the pics I took,I tried to take the plastic cover off of the retractor but it's riveted on to it
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