Thanks, to all for your thoughts & input. It's good to hear that some of you have seat heaters in open cars and find them useful.
ASUMHLY, thanks for the Heritage link, I didn't know they installed seat heaters for free if you provide them when they reupholster your seats. There must be some demand for them to include them in the website. I'm still a long way from interior work but I will be checking with them. Also, though I personally have no desire for GPS, your set-up is sweet - I always appreciate 'stealth' installations.
John Turney, One of the reasons for this thread is that I've been wondering the same thing - no where in my previous research had I seen heaters installed in seats like ours and have been wondering how to deal with the wiring for the back as well as how to be able to lift out the bottoms.
HealeyRick, Thanks for the link to Corbeau heaters. They look like the solution I'm looking for. Looks like a two-piece approach is no issue and seems like they will work well (and have good feedback/reputation too). I will be talking to them.
Finally, to any who think I'm simply unfamiliar what to expect from a Healey, let me offer this. I bought my first Healey a couple of days after Christmas in 1969 in Seattle. My first year after high school and I had just worked a ton of overtime during the Christmas rush that gave me enough dough to finally buy a Healey. Paid $450 for a pretty clapped out '56 BN2 but I was in love with it. I picked it up on a Saturday with grey skies and I put the top down and drove over Snoqualmie Pass to Ellensburg, down the Canyon Road to Yakima, Back over Chinook Pass to Mt. Rainier and then back to Seattle - it was snowing going over both Cascade passes and raining in Seattle when I got back - I never put the top up and had the best drive of my young life. I have been travelling and playing with Healeys since (including over 15 years racing my BN4) and love cold, crisp fall/winter days for a brisk ride. I've been working on resurrecting this BT7 for the last 6 years (I hit a deer on my way home from work in the dark one night in 1987). I am assembling the chassis/running gear now with he hopes of having a running/driving chassis by spring and installing the body and paint next summer - then the interior, so this thread is basically more planning stage than imminent.
Again, I appreciate the constructive help.
Dave