I can't answer your questions without trashing my own to find out, but I don't think you will find anything unexpected. It looks to me like a plastic or similar hood. This should be glued to the reel seat spacer and the spacer glued to the blank.
I would recommend buying cork rings rather than hoping a factory made grip will fit (which is what I infer you might be attempting). Glass = fat blank butt, much easier to fit a grip by enlarging the bore of single cork rings one by one than reaming out a narrow bore assembled grip intended for carbon rods. Also easy that way to accommodate whatever size of reel hood you find - assuming you wish to keep the original seat - and to shape the grip to your own comfort.
-remove cork (and guides above it) taking care not to cut the blank
-fit rings individually to the blank, number them to keep the order
-glue up separately with a clamp
-turn down to shape on a lathe or drill (really easy to do with a power drill and carriage bolt shimmed with masking tape)
-glue assembled custom grip to blank
gorilla glue or slow epoxy used sparingly throughout
Custom cork handle turned on a home made lathe