I ordered a 0311-201-001 dipstick and was invoiced for that number, and the bag stated that number, but the actual dipstick is a 3311-301-003.  I was assured that they are the same,  In any case, the 3311-301-003 is 6 1/8" over all and a full inch shorter than the one that has been in the gearbox, so I assume this gearbox has been running below the appropriate low level indicator for a long time.  No harm can be observed at the moment.

Richard
Mamba
A54 68