Ok I think I understand now.
I'll have to check tractor supply, I am mostly worried that I'll never be able to put a post hole digger on the tractor.
The Woods PHD25 would be a good fit. It is part of their "Estate" series which is designed for use with SCUTs. It uses 30" long augers (either 6", 9" or 12" diameter) so it will work fine with the reduced lift height of SCUTs.
The Landpride PHD10 is very similar to the Woods and also part of their line of implements for subcompacts.
Hope this helps.
From a purchase end, you will find a good selection. Your ability to rent or borrow, may be a little more difficult. I don't know if the rental equipment companies carry equipment sized to SCUTs or not. To me, a post hole digger is something I would use for a rare project, but not something I would be likely to buy, but your needs obviously may be different.