How Do You Replace the Upper Heat Stove? Cant get the darn bolt out!

[jb3t]

My upper heat stove, which is a little bracket that deflects heat from the engine up into the metal tube that leads into the tail end of the air cleaner, is toast. The little piece that secures it to the single screw that holds it on has rusted through and now I am at risk of losing the metal tube as I drive down the road.

Has anyone ever successfully extracted the screw (I think it's a screw) and replaced the heat stove? I see no slot on the screw and have tried a pair of Vice Grips with no luck. Im not even sure the thing unscews. It could be a rivet.

Anyone have any successes or failures. Here's a picture of the culprit.