All the online stores have them. I can't remember where I bought my countersunk stainless sets (complete with proper pickup springs) - might have been from
Acme Guitarworks. Ah no, it was from
Guitar Nucleus - with springs but switch screws seperate.
Just looked and I have two full sets of pan head screws (Philips) with switch screws (slotted) I'd be willing to give to good homes.