You’re not going to be able to just order parts. Webra is long gone, and I believe Mecoa took the brand over, but isn’t likely to be making any new parts. You may have better luck posting a classified wanted ad for what you’re looking for unless it’s something other than the basics like bearings and piston rings which can be found from the aftermarket arena. While there isn’t any notation of above the “speed” designation, there are two different Webra 120s listed - the differences coming down to port timings and perhaps slight differences in outward appearance.
https://sceptreflight.com/Model%20En...sts/Index.html