Yes
Can rims for a 96 caprice fit a 69 Chevy chevelle
Yes
1991-96 Buick Roadmaster, 1991-96 Chevy Caprice/Impala SS, possibly 1993-96 Cadillac Fleetwood
yes. The 91-96 caprices are completely interchangeable.
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I believe that the both the 96 vette and caprice use the LT1 (I think 96 was the last year for the LT1). In that case, yes.
Yes. 91-96 impala, roadmaster, caprice, and fleetwood rear end are all the same and will fit with no modifications.
yes
If it is a 94-96 caprice with the L99 you will get a good sound as it is identical to the 350 LT1's. If its a 'box' caprice style 4.3 you may want to go straight pipes.
no
yes it will fit may have diffrent window trim and you will have to use your door panel if it is a front door you will have to change mirror also u will need to change your handle your 91 should be chrome
The doors for a 96 will fit a 93 or vice versa. The body style is the same except the rear quarter panels for 91-93, and some interior changes and motor changes but body wise is the same.