Mr. G's stocks two possibilities on p. 125 of its catalog. Item FA 4259 is stainless steel and correct 3/4" length. Item FA 3443 is zinc plated steel, 1" length and would probably need to be trimmed to 3/4" length.
FA 4259 H $ 0.45
1/4-20x3/4 Pan,
Slotted 18-8, S.S.
FA 3443 A $ 0.45
1/4-20x1 Pan
Slotted, Zinc
Looks like there is no minimum order, so won't have to buy a box of 50 to replace four valve cover screws.
An excellent resource.
Thanks Otto
