window frame advice needed.

I got #8 flange head screws from HD, worked just fine. The 4 other clips that come in the set are so small a difference it is of no significance.
When you drill a hole in paint use paint or a good sealer in the hole drilled.

I just did my coupe but have 3 more cars to do and it was a huge savings to go this route over that. Look in the 68-9 parts manual - the clip I listed 6002263 is the same part number as the factory ones.

these are the actual screws.
http://www.bonanza.com/listings/-8-x-3-8-flanged-head-phillips-screws-w-sealer-100-pcs/93885739