Those look very similar to the ones I put in the Miata:

http://www.duettomotors.com/general/gen_seatheaters.htm

If the seats come out of the VX fairly easily and the covers come off and will go back on with some sort of semblance to how they looked before, it would be pretty easy mod to do. The Miata seats are formed like the Recaro- though not quite as drastic. Bottom line, I would assume an auto upholstery shop would handle the seat side of the mod no problem.

Keith