RM2000 sat driver replacment

I need to replace the drivers in my RM2000 sats part #RD0303-1 I was wondering if they is a better polk driver that I could install. I see that the RM II (same tweeter) uses RD5001-2 same size anyone know the differance in the two. Is it just shielding? Any other polk driver I could put in there? Is there one that uses rubber surround instead of foam?



Thanks!

Doug