Preevo rotax max power valve compression spring

hi guys,

i have a 2015 pre-evo rotaxmax sr engine, now getting it prepped again for some practice days, nothing seriousl. The old power valve compression spring is alittle rusted, where can i find a pre-evo power valve compresssion spring? or can i use the evo powervalve compression spring?

But we have used the spring from the gasket set of rotax max in our pre evo engine recently and with some adjustments to the red knob , the valve opens clearly and correctly in 7.500 rpm . So i dont think its gonna be a big problem. To use the new one . But thats just my oppinion . Maybe other guys had trouble with that .