TRG scope rail screws

Evening, I've acquired a Ken Farrell pictaninny rail which is to screw onto a TRG42 but with no fasteners! Came from a parts pile.
Typical sako I believe it's a M3.5x0.6x7 CSK for the TRGs.
Been down the road of most fasteners and gunsmith who are aware but no stock.
I've also tried a screw from my T3X which is a different thread.
Closest I've found is a CS3506 carbide button screw but with a different head taper...

Have u tried Anzor
Shows they got stock, u will have to cut to s
Length

Anzor are non ferrous specialists?

Yep , drop of loctite to stop galvanic action
S/s be Plenty strong enough