For future reference we sell the original GM clips used to install the top to door glass seal ( roof rail seal )
So there's no need to buy generic clips then modify them to work. They can be found on our Blazer weatherstrip page
https://gmcpauls.com/blazer1.htm
Part # 19839137
69-72 Blazer / Jimmy Door Glass Seal Retaining Clip For Double Wall Top
1969-72 Blazer/Jimmy Door Glass Seal To Top Seal Retaining Clip. ( Roof Rail Seal Clip ) Original GM clips used to install double wall top roof rail seals to top. For all models with double wall shell top. Sold each, specify quantity after adding to cart.
Manufacturers Suggested Retail $1.42 each
Fits: All 1969-72 Chevy Blazer, 1969-72 GMC Jimmy With Double Wall Top Shell Sold Each for .75
Paul Jr @ GMCPauls