If y'all recall I ran into this problem a while back with my 200 Johnson when I lost 3 of the 6 carbs to a fire that melted them. On my 1991, plastic body carbs, the 175, 200 and 225 are all the same. The venturi and the jets change in size, and the butterfly is slightly larger and the screws that hold the butterfly onto the shaft go from 2 screws to 3 screws for the 225, but the mounting holes for all three are the same. I don't know if this holds true for all the plastic carbs (depending on the model year) 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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