wanted a starter reduction gear

I heard those are as rare as elephant chit in a canary cage ! I punched that number in a couple of places for you and no hits

Shade , how is your buddy doing , I talked with him for an hour one time , down to earth and very knowledgeable , super nice guy , told me bring a trailer and a fist full of dollars and I could load up on 300's

I am going to take a stab at this , but 350's are not my main stay , I " think " the 25t gear was used on early models and for just one year or so , and the later models were 41t gears ----so what year is he actually looking for

I know what you mean about e-bay , when you do a search it will give you a few parts with the same number you punched in and then fill the space with parts that are close , I always read the fine print of the description before pulling the trigger ------ I don't have any 350's in my fleet , but have parted a few out and read many threads on 350's , seems you are looking for a very rare piece -------------- how much would have to come off the one that you have that is thicker , maybe grind off a little at a time with a grind , I say a little at a time so you do heat it up too bad and lose the temper , seems they should be able to mill it , but they might be afraid of breaking cutting tools on it

are you sure that is the right part number , as it comes up with a different number of teeth

28131-HA0-680

https://www.ebay.com/i/322745670910?chn=ps&dispctrl=1