Hardened steel pinions

[Sammus]

Howdy, I'm in the process of figuring out a setup for a Revo conversion. I've noticed several posts saying to only use the hardened steel pinions with a steel spur. Well I've got a bunch of plastic spur's and wanted to give them ago, but alas I cannot find any non-hardened 5mm steel pinions!

Are these an old product line or just something that should be available elsewhere that mike doesn't sell? will it even matter if I use the hard steel on plastic? I'm competent and setting the mesh properly and have never stripped a plastic spur since one time I got the mesh wrong on my first nitro rc car years and years ago...