The Schumo headlight is bored for the bulb and wiring. Tiger 1 system comes with two lamps but no longer in nickel silver. That set does have a threaded stud and nut for attaching to the tank. The P4 unit is a single light, nickel silver, and is bored for the light bulb. No threaded stud or nut. Schumo is out of the P4 light, I have them in stock. Schumo and I both have the Tiger 1 lights, mine in nickel silver, theirs in a different metal, the 'new' version.

http://www.etoarmour.com/product_det...uctID=PZIV0013

Schumo has also been around long enough to understand VAT and who to collect from and who not.