Elliott, Those you link to are not the same size, but close. Well they say 48P in the description but they also say metric. I thought 48P was imperial! I may be wrong though. They might work, but strictly they won't be perfect. Hard to know exactly how well they would work without trying them myself.
DCM71, do you know of anyone else that makes 0.5 pitch pinions? To be honest, I've found the Tamiya steel ones fine though, and both the DI and Super Astute ones are steel.
Trev