Custom/Hybrid Pump size question...

Does the outside diameter of the pump increase when going to a bigger pump? Say a 140mm to a 145mm? I am stuck trying to figure out what size pump I need to buy for my hull. It’s set up for a Kawasaki pump and I have a solas 140mm mag that clearly isn’t the correct size. It is a good amount smaller than the pump tunnel and shoe. Thanks
 
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