020 normally (rod change) - not sure of the code for ratios though as they came on Mk2 Golfs, Seat Ibizas, Sciroccos, Caddys etc & had different ratios/final drives for some of the petrol & diesel cars
http://www.4crawler.com/Diesel/VW_020_transmission.shtml
Might need linkage adjusting
linkage alignment tool
Think you can download a full size pic of this tool, trace it on a plastic cassette case & cut to shape - does the same job
This might help (for a Mk2 but Mk3 is virtually the same)
http://www.clubgti.com/forum/showthread.php?t=129347
Got a 020 from a Mk2 8v Gti, AUG ratio code I think if you need one