As usual, lots of great advice and questions given by Ben/rambow. One extra question from me, which is perhaps a little too obvious and need not be asked is... You did get the rally seat foam/bun with the rally seat covers, yes? Your side bolsters do not look anywhere near as tall as the photos on Legendary's website.
I reupholstered the seats for my '66 over the summer using Legendary covers and ACI buns. I used rambow's thread as a general guide & confidence booster, and also relied heavily on the step-by-step procedures found in the video on Legendary's website:
LINK
Mine are not the rally covers, but the process is the same.
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1966 Pontiac GTO (
restoration thread)
1998 BMW 328is (
track rat)
2023 Subaru Crosstrek Limited (
daily)
View my photos: Caught in the Wild