Question on bucket seats with backs

[CG]

So I think I sorta know what I want because of a thread I had over in the burb area.

This isn't a WTB right now via the board. I'm going to start a search for a set of sport buckets with the plastic backs, they don't need to flip forward on the passenger side, but if they do so be it. Ill be looking semi locally, I'm in zero hurry. I thought I had a line on a set but it fell through.

Is there anything I need to be aware of when buying buckets? I for sure want seats with the plastic backs. And they need to be 71/72 style. Because they are ridiculously priced I don't want to buy some and find out ... Oh those are for 73, or these seat mounts are the wrong style. Maybe there is a thread that points this out? I was unable to find one via search.

Thanks for any insights.