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.Corsa captains call thru-transom system
This is a complete standard thru-transon system.
See the chart below to determine if it will fit your
boat.
Measure the distances For A & B, if you come up with the following dimensions
(see below) or more the standard system will work. If you come up with any less
you will need a custom system.
Click here to get a quote for a custom system.

MerCruiser 305, 350, 5.7L, 377, 6.2L, 383.  
A = 15 1/8" or more (Good)
                                                          
B =   5 1/2" or more (Good)

MerCruiser 454 & 502 (not 496)                  
A = 16 5/8" or more (Good)
                                                          
B =   6"       or more (good)