Your "Heat" folders are NOT from Camillus, they are gray market Chinese knock-offs imported by low life Stains.
The real Camillus Heat, Sizzle & Blaze were made in Taiwan to Camillus specs.
That said, for your Dominator clip you need 2-56 screws. I cannot remember the exact length we used, but if you get between 3/32 - 1/8 long you should be fine. Just ensure the length of thread is less than Titanium handle thickness.