Reply to "I believe Number of USA GTS cars produced is 150"

There were two different parts books around in the '70s, and the one most are familiar with is the U.S version with an orange cover. But there is a 'supplement' that covers Euro cars and includes 10x 15" wheels, Weber intakes and the Gr-3 stuff. I have a copy and lent it to the POCA Store for inclusion in their "everything" CD. Since Ford didn't want to be responsible for racing parts not sold on the cars they were distributing, such parts were sort of unlisted here.
Much of this Euro-only stuff is also shown in the second factory parts book published in 1982 with a black cover. It also lists the GT-5 and -5S car parts.