I have the same problem. Short answer seems to be Happ (OEM) doesn't make them. Check out this relevant response on another thread:
https://pinside.com/pinball/forum/topic/stern-star-trek-pro-coin-door-question#post-1919396
For reference, the original part is SuzoHapp Part # 42-1247-20
I'm going to try the opaque black restrictor with red rejectors. I'll post a picture when it gets here. And let me know if you order a manufacturing run of reds from Taiwan ><