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I'm pretty sure mine was a T-45, I don't have a T-47 in my toolbox and I've never had a problem putting on or taking off, which I think I've done about 2-3 times in the last few months.
My understanding is that sometimes hardware will vary inexplicably on the same model within the same production year, or maybe it's just the dealer installing the pegs and mixing and matching the hardware, as I've heard of people having allen bolts in there as well, both metric and SAE.
I have a set of T-handled torx wrenches that I think range from 20-55 by 5. They reach no problem and have worked fine for bolts that I can't reach with regular L shaped ones. I got them at Harbor Freight for $10-15. They aren't pro quality, but if you're just a dude messing around in your garage they're fine.