I’ve had two very different experiences with SMS. They appear to be, very often, the only source of original or like materials. They did my door panels and piston covers for my convertible about 5 years ago. These were beautifully done and they called a few times during to make sure of exactly what I wanted, were courteous and responsive, and while it took about 2 months, I couldn’t be more satisfied with them.
Recently, I sourced some vinyl from them for a convertible boot I am having made. On the front end they were fine, but it took about 2 months to get 3 yards of vinyl from them. The color match was pretty good, and it was original material. We’ll see how it plays out with the boot. When I called to ask about the material after about 5 weeks, they were very short with me on the phone, so who knows?