Either my Googling is getting lame or these specs are hard to find. I'm looking for the thread size, length, diameter all things relevant to the specs of the 6 screws for a vintage tremolo, the 3 for the top plate/block mount, pickguard, switch mount, etc. I'm going to be ordering a countersink bit from McMaster-Carr and figured I'd check for a one stop shop on hardware.
There's no standard for this hardware. Depending on the model and hardware used, it can vary. It can also use either SAE or metric threads for the little saddle screws and the screws to attach the bridge plate to the block.
The pickguard screws are #4 in length, but the head size on these screws varies quite a bit, depending on who makes it. Best bet is to buy hardware from the usual scumbags by name, not by spec. For instance:
-Pickguard screws for Fender -Bridge screws for Fender vintage tremolo -Neck screws for Fender
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