You are good to go! The JConcepts Finnisher - T4.3 Qualifier Series body will be a direct fit. The T4.2 RS (Race Spec) came with standard T4 front shock tower/arms.
I have a T4.2FT and it sat for a darn good amount of time on shelf, because of the (sorry) super ugly 🤢🤮 Bulldog body that I just could not bring myself to paint/run. I even bought two spare Bulldog bodies for the darn thing. I don't know what I was thinking. I guess I though I'd grow to love...
If you have the T4.2FT with the gull arms and SC10B shock tower, I don't know of any direct fit bodies. But, if you swap out the gull wing arms and wide front shock tower to the normal T4 stuff, you can use JConcepts Finnisher - T4.3 Qualifier Series body