Little known fact in AH is that the P-47D-30 is actually a D-40. I have no idea how the naming error came about, it must have just been a brainfart.
Anyway, even though the zero-length rails did not come factory equipped on the P-47 until the D-40, earlier models were refitted with the zero length rails and 2850 kits were produced to do that.
As Guppy pictures attest, the P-51 could carry rockets in conjunction with drop ordnance. There is also another possible combination not seen in AH, and that is for an extra 2 rocket rails in place of the bomb pylon to give a total of 10 rockets.