Are the interior panels and dash boards for1st gen RX-7s interchangable in any way? Say, could the dash from an '83 fit in place of an '85?

 

Yep. You just have to make it work. However, if you put the dash from an '83 into an '85, you will need all the assorted switches and (I am pretty sure) the gauge cluster too.

Read my thread on taking out your dash. It's lots of fun.

 

79-80
81-83
84-85

Those are the breakdowns for interchangeability for US models only.

YMMV SPSFD

 

would canadian 7's be the same as the US, i know the japanese one sare diffrent and have hole diffrent kinds rx7s. iam asking this cause i phoned the guy at a local mazda shop to try and find a water housing and he told me that there is none here so i told him i could probel get one from the US and he said it wouldnt work cause apperently the US has diffrent 7's then here. BUt we all know the local mazda shops across the world barely know what a rotary is in the first place, we have had help with the release of the rx-8 in the past 2 years though