OK I found ones to replace the back body mount that I break most frequently. I rarely break the front mounts since moving them to the back of the front shock tower.
The mount I'm using now is the CEN Matrix TR body mounts. It fits great on the rear shock tower. I just cut off the little knub (too big to fit in the crt.5 slot) and attached it with the stock screw. It's about 50% bigger diameter and seems unbreakable.
Here's a pic of the item:
I also think the RC8T body mounts would work good, especially on the front tower.
E-CRT.5 Monster - RCM chassis, MM/Medusa 50x3300/3s, truck tires, 1/8 shocks
E-CRT.5 Stock - Sidewinder/4600/2s, buggy tires
E-8ight - Tekin RX8 2000kv/4S
E-8ight T- Tekin RX8 1700kv/5S