Starting in 1970 the part number for these front lower Valance panels was #3967176 with only a few small holes drilled on bottom (no front spoiler offered in 1970). Then I am guessing in 1971 the same part #3967176 was used, but had all the holes drilled, including the two holes on the sides (in wheel well) so spoiler could be installed if ordered. Then sometme later (maybe a few years later) the panel was changed to #327536 and should have all the holes drilled. I have an NOS front lower valance panel with GM sticker #327536 and it has all the holes drilled except the 4 holes (2 in each wheel well) that seems odd. Does anybody have this part number and does it have all the holes drilled out. Also anybody wanting to buy a OEM front spoiler do so. I bought one and lined it up against the NOS panel with bolts and it fit perfectly. I was shocked since reproduction parts are usually crap. John. PS sorry this is so long.