Transaxle part numbers.

Does anyone have any information on figuring out these part numbers off of my tranny:
 
A1101992  (I'm guessing this is the serial number?)
113.301.102A 5  (Is this the case part number?)
113.301.211 8  (I think this is for the reverse gear housing, as it is far forward on the case and looks to be a separate part from the main housing?)
 
Any help as to the data listed above would be greatly appreciated.  I can find no information on this serial number A1101992, anywhere on the web.
 
Thanks.