I would suggest you get material samples from different Vendors.I am probably going with Too Tall,Because I need both steel seats ,and the price seems good.
I got samples of red leather from him and TRF.TRF leather has finer grain,and is thicker.while TT is coarser grain,almost like pigskin,football type,and a little thinner.I havent got sample from Moss,but will.The Moss seats
I have seen at shows seem the thickest,especially the front seats bottom front panel,that is almost like a smooth belt leather ,closer in my opinion to the original seats.
I have also noticed variations in front seat piping with some white piping going across the front seat bootom/front panel,while mine had this one piece of piping color matched to the red seats,rest of piping white.
Tom.