Question on value, '70 interior Options

[theer]

I have a '72 which I had cobbled together from basically two or three parts cars. My first was a 1970 (4 cyl) with 40k miles and a perfect interior but beyond my ability to save from the attack of the tin worm. The second was the '72 shell I bought in California.

Because the '70 interior was/is pristine, I put it into the '72 shell... including the fixed passenger seat, and non-retractable seat belts.

I would now like to update to the more correct movable passenger seat and retractable belts. I have collected all the parts I need for the switch.

Questions: what's the value of a really nice matching original basketweave seats / back rest / seat belt set (sadly, no door panels)? Were the /4 and /6 interiors the same back in 1970?

I also have the original radio with chrome faceplate.

I know, I know.. need to post pictures. But I'll do that for the FS ad.

Thanks,
Tom