Well, an adapter plate is an interesting idea. But I have little confidence that a $79-$100 seat will hold up any better than the $200 seat from GRAVELY. Both the original seat and a GRAVELY replacement have both failed in 7-8 years. And my tractor has never spent the night outdoors in its 25 years.......Of course the Michigan (who makes the seat for Gravely) seats have been available for years, but the bolt hole pattern doesn't typically match a G series rider. I think the simple solution is to make an aluminum adapter plate.
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