The ten or eleven projections on the skin, as marked on the earlier image. These are immediately aft of the cutout with the red (inert warhead?).
You mean this part?
This is where the missile can be opened, and the warhead can be loaded/unloaded.
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home