They actually suit the car well John
I was looking through some old brochures a couple of months back at trophy cars. It mentioned heated seats which I'd also not heard of but I didn't notice anything about alternative materials
My ZT has very similar seats to yours , which again not seen in brochures.
I think towards the end all sorts happened and brochures weren't updated possibly because of costs.
Mind that didn't stop them from building a supercar and converting the 75/ZT to RWD at great expense
