Just remember anything dealing with accuracy between A/B and C/D models all depends on timeframe you are modeling, pre MISIP, etc.... The wheels are a major item ( but pre or post MISIP) as is the speedbrake fairing which changed to a more scalloped look on the C's in comparison to all A models with the wedge shape except pre production types and first jets with the first style of speedbrake (short one) and lets not forget wing tips changing from the earley earley A models to the C. The panels changed as well in configuration between A and C models, plus take a look at referances between F-15