I agree with Garry and Thelews, you need to do your homework, if you want to keep value at the high end. If you feel that a new look to the interior is wrong, then so be it, put I feel strongly that a new interior makes me feel great when sitting on it. Why do we by new family cars every few years, to feel the newness again both in the machancials and in the interiors/exteriors as well as the new gadgets. I want to feel when in my SL that same feeling as when, if I had bought new in 1970, thus, I made sure to do my homework when restoring to assure the closest in materials, tires, shocks, seat cushions, carpet, etc. to original.
Bob