Thanks Gary! Please take a photo and that will help!
rsr.. I spoke too quickly...
I spent 45 min looking for the screws. I remember removing them, and know I put them in the same box with the flapper and other parts ... but I have apparently since bagged (and hopefully) tagged those screws, and relocated them (to a different place I was unable to find in my search)!.. sorry.. when I find them, I'll photograph them for you...
While I was looking for those, I did find (in that same box) a bag of the original insulation clips, with a few of the OTC replacement GM clips, AND a bag of the reproduction clips that I bought a year or so ago to replace a couple that were missing when I bought the car in '76 (that was the reason I purchased the OTC GM replacements!)... now they have themselves been replaced!
(If anyone needs one or two of the OTC ones, or a handful of the repros, I have extras as I only needed a couple to replace a couple of missing originals! I did take some photos of these parts for you to make it easier to know what you are looking at: The original insulation clip is on the LEFT in each of the first two photos. the reproduction clip is on the right. From the bottom of the reproduction clip, you can see the CHQ stamp (Classic headquarters) which has made an excellent reproduction of the original clip! When installed, the CHQ stamp will not be visible! In the third photograph, is the GM replacement part which GM sold in the late 70's for the insulation clip (clearly not the same as the factory part). This last one is what the resellers call an 'NOS' part (Yes, new.. maybe old stock, but NOT original factory part)...