With the mounting pattern on most GM mid size bucket seats being the same, I feel that G Body, F Body, S Series, Astro, etc would be the same.Might have to compare the bucket and split bench ones, have a feeling GM kept that part the same. I know when I needed one for a split bench track one from a b-body was identical in style/length. Other platforms might interchange as well (f-bodies & j-bodies?).
This would work also. I have done it. Some aftermarket seat tracks use this methodBend one up from a clothes hanger until you find a suitable replacement.
The bicycle brake cable would work fine also.They are different lengths for the 60/40 tracks and the bucket tracks. The bucket seat ones are shorter. So you can take one off the 60/40 seats and rebend one end the make fit the bucket tracks. It is just a piece of metal wire. You can make them pretty easy. I doubt you're doing a Concours d' Elegance level resto on your Gbody so just make one or two. I have used brake cable from a bicycle before and crimped the ends and it worked fine.
Bend one up from a clothes hanger until you find a suitable replacement.
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