Honestly, with as wide as the body is on your car I wouldn't even worry about it.
I know what you want is for someone to come along and tell you exactly which part number to buy that they have successfully bolted to a RC8B3.2e, but the odds of that happening is quite low.
Searching "mud guard" on amain I see probably 7-10 different options I could probably bolt to the front of a RC8B3.2e rear arm. Just looking at pictures of a RC8B3.2e it seems it would be pretty easy to make something work.