I want hi-backs in my '66, I want them to match the fabric on the '66 rear seat and I want them to bolt in. Locally, there's a pair of '71 hi-back seats but from what I can tell replacement seat upholstery featuring the Comfort-Weave material isn't available for them. However it is available for the '69-70. Is that about right? If I want hi-backs but wish to match somewhat closely the Comfort Weave I'll have to use the '69-70?