That's actually iJeep's shorty antenna (in the pic posted above) Try shooting him a PM, maybe he could help you out. As for me, my shorty just fit right in.
Thanks bro for finding that information, i see there are two types of antenna on his ebay page... which one should i get ...TYPE R or the EURO antenna's
So those that he has listed, ^^^^ are the same that you and Hannes have, and the screw right into to original antenna locations with no alterations? If so, I see one of those in my very near future...
just an FYI- i ordered my short for my WJ from this seller and i got the faded black one pictured. i had to cut the stem to make it fit. none of the additional adapters worked so i just sawed a cm off on the closest fitting end they supplied.