The Wilky Empire takes a solid Wedge Blade, impossible to buy any made nowadays, never seen any NOS, i guess it is a case of finding a set with blades that are in half decent conditon and sharpen them up again.
Valet Auto Strops (only some models) can take a GEM Stainless SE Blade with the spine removed.
All the Gem / Ever Ready ones can take the GEM Stainless SE Blades that Paul at Connaught sells.
The Valet is gonna be my next project, wanna get one and tru with a modified gem blade.