Where specifically....tub or rear quarter? Inside the wheel tub they are the plastic type and on the rear quarter drop down (behind the tire) it is rubber on my 67 04B and 05B.
In the tubs are plastic and the drop offs have rubber. My 69 has the rubber type in the tubs so wasn't sure what was correct.
69 Z/28 Dover White X33,ZL2,PS,M20,Std.int.04C
67 SS/RS Mt. Green 1W,2LGSR,3SL,4K,5BY,07C
70 Nova L78 Blk. Cherry,Sandalwood,M21,02B