Would anyone know the difference between the 722.319 & 722.351 transmissions?

One WEB site I found indicates the 319 is for 1986-1989 300-SELs. This same site shows the 722.351 being used by 1990-1991 300SELs.

germanstar.com shows the 722.319 being used by 1986-1991 300SELs.

Arthur Dalton posted some info on 722.3xx and 722.4xx transmissions in the following thread. The 319 was not mentioned.

http://www.peachparts.com/shopforum/showthread.php?t=23833&highlight=722.351

I know how to locate my transmission # and knowing which 722.3xx I have isn't the issue. I'm curious about the difference between the 319 & 351.

Thanks for your time.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"