I have a standard USP 9 and I’ve bought the threaded barrel, and am waiting on the recoil spring (as recommended).  

I’d like to get suppressor height sights on it.  Where should I buy them from?  I don’t need tritium, and I don’t need them to be adjustable.  

If I get a solid zero at 25 yards, that’s good enough for me.  

Black rear with a dot or black in the front is fine for me.  

I can either replace them at home or get them done.  

Thanks.

I would contact HKParts.net.  They should be able to tell you if they are available.  I didn't see them in stock, but they have always been helpful to me.