Looking for Getrag 240 transmission

70's Opel Getrag 240 5speed transmission. The early Bimmer 318i's that are "240" Getrag's aren't the same, however the internals are roughly compatable. The Opel specific 240's are basically running out globally and mine started grenading last fall so I have to rebuild it. I have looked everywhere and figured I'd try this group before heading to ebay. Thanks for any help.