Engine Mount vs Nose Gear Leg (9A)

Friends,
I have some doubts regarding the nose gear leg and the engine mount.
When you order the engine mount (Rotax to illustrate the example), the nose gear leg is the same part number no matter the engine mount (let's say I switch to Lycoming), or each engine mount has its specific nose gear leg part number?
I'm not sure if I was clear on my words, but I hope you guys understand what I'm trying to say.

Thank you very much!

Van's does not support Rotax in an RV9. There is only one nose gear leg for the 9.