I read in the last German Mangazin VW Szene this:

VW Doka Tri Star 14 Zoll Synchro two Diff Locks, dark green, 147.000 km
ATM 30.000 km ATG 10.000 all extras Tel. 0049-(0)5304-4076

ATM means Austausch Motor - New Engine -=20
ATG means Austausch Getriebe - New gearbox -

maybe its interesting for one off you, call them dont mail me, im not
the seller!

Ralf Milewski Berlin Germany

`78 2.5 L WBX 		thing
=B478 2.0 L Typ IV 	1303 convertible
=B471 				1302 resto objekt