Trim motors for Yamaha 350’s

Here's my 2011 F350's trim motor. Picture taken in July 2020 with 750 hours. Boat was stored in a dry stack, not in the water. These things just rust.

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OEM are about $800. Seem to be higher quality but will still rust after a while. Aftermarkets are everywhere and are a third the price or less
If you remove ENTIRE assembly and send them to five star Marine they will completely rebuild everything and new motors and send your unit back for under $500.00 if boat stays in the water they offer a several step protection and re paint to factory color for an additional $100.00 lncludes a full 2 yr warranty and guarantee they are better than original because they use superior parts. Getting ready to send mine soon. Cost of motor alone is almost $800.00 from Yamaha
 
If you remove ENTIRE assembly and send them to five star Marine they will completely rebuild everything and new motors and send your unit back for under $500.00 if boat stays in the water they offer a several step protection and re paint to factory color for an additional $100.00 lncludes a full 2 yr warranty and guarantee they are better than original because they use superior parts. Getting ready to send mine soon. Cost of motor alone is almost $800.00 from Yamaha
Also if they are 350 hp motors were are the 3rd set of mounting bolts? Not sure what size motors you said they were