Looking for some slotted Fillister head screws 2 1/2 inches long, 12 x 24 tpi. These are for a Indian chief. I can cut down the long ones to fit all (cam cover and oil pump) applications. Would like to buy a box of 50 or 100 ? I could buy from the indian guys but need at least 3 sets. tried mcMaster carr (only to inch and a half) I would also need the thin walled lock washers to go with. Since maybe I am dreaming in zinc brite dip also? Tried google but nothing after 6 pages. Any sources?