Interchangeable lower unit for 2004 Mercury optimax 135 with 25 inch shaft and 2:1 gear ratio

[Zackaryfarmer90]

Trying to find out what other lower units are interchangeable for my motor as stated above 2004 Mercury optimax 135 bluewater series. Lower unit has the 25 inch shaft with 2:1 gear ratio.

 

[Chris1956]

What does SEI say? They should list compatible gearcases across models.