I agree with Jere, if you have to get another one, go to Home Depot, Lowes, or any other local electrical store. You should be able to pick up a mogul MH
I guess it is possible that the bulb warped the socket, but it just doesn't seem likely. Typically those sockets are rated for bulbs up to 1500w. Can't believe it would warp with a 400w bulb in there. But I guess anything could happen.
At any rate, it neither one of the CoralVue bulbs will fit into the socket, I guess you will need to replace it.