Plastic wire hold downs on Fender well

On the drivers side wheel well there are three plastic hold downs for the wire, washer tube, etc. The ones on my 65 are/were small and weak compared to the ones on my 70 442. The 70's require holes and not slots like that are in the 65. I ordered three from the Parts Place that would go with the 70. So what I did (I DID NOT want to drill more holes in the fender well) was to cut the push pins off, level the remains with a Dremel sanding disk then attach them with 4 inch cable ties via two (per side) 5/64 (.1)holes drilled in foot of the plastic clip.  The plastic cable ties come through a slot NOT a hole, so they stay secured. You cannot drill the slots and use the later plastic hold downs as the slots are too close together. And  you have to look closely on the underside to tell they aren't the push pins sticking through there. My guess is that someone at Olds realized the weak hold downs need to be beefed up so it was changed later.