BillyBob, The heaters are dual element - seat cushion and backrest. Double the work.
Mark, I reckon I can give it a try. Plan is to go up Saturday morning and yank the seats as a complete unit. Plan to get them out and home in time to get the girls to their riding/horse care lesson. That naturally puts me behind the eightball, cuz surer N all get out I'll run into a snag. Does the sewing require a special needle or upholsterer's thread?
Only catch to the deal is I have to return my old seats to go with the wreck, so I'll have to disassemble very carefully.
Couldn't find anything in detail about the mounting of the heating elements in the manual, plenty about them except the mounting. I might also take the cowards way out and just look through the "seat wharehouse" for a matched set with heaters installed, but that might require me to hum a few extra bars

.
I'll let y'all know what's up. Thanks for the help.
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.