I know the photo you mean. I think Bill would agree that they couldn't carry 1000 pounders AND rockets though they did fit the P-38 wing tanks ( 165gal) as in the photo above yours.
Attached is an RAF Mustang III (P-51C) FB241 in Italy 1944, with 1000 pounders ( note weight on the oleos) used on occasion for specific missions. Unit is 112 Sqn. possibly at Fano.
Also shows not all Lend-Lease Mustangs were in RAF camouflage, this is OD-NG .
In June 1943 an RAF Mustang I was experimentally fitted with 8 rocket rails, apparently not taken up.
Nick
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