'07 Sport vs. TRD Pro wheels - what are the specs?

[G.I.G.]

I have an '07 4Runner Sport with the OEM 17" sport wheels and 1.25" Spidertrax wheel spacers. I was considering some new wheels when I go to get a new set of tires later this summer. Specifically, I was looking at possibly getting a set of the TRD Pro wheels in gray.

Wheel, TRD 17 Inch Alloy (TRD Pro - Gray) - TRDShop.com

My question: what are the specs on the TRD Pro wheels and how do they compare to stock wheels when it comes to offset and backspacing. I can't find the specs on these wheels anywhere, not to mention the specs of my factory sport wheels. I'm trying to determine if I would need to keep the wheel spacers on for the the tires to remain flush with my fendors, or if the TRD wheels would actually stick out further with the Spidertrax wheel spacers.

Does anyone know the specs on the TRD Pro wheels and/or the 4th gen sport wheels?

 

[G.I.G.]

From checking some listings on eBay, people have the TRD wheels listed as a 17x7" wheel and the OEM 4th gen Sport wheels listed as a 17x7.5" wheel. If that's the case, I'm scratching my head as to why Toyota would make the TRD Pro wheel narrower than the standard, OEM offerings.

I still can't find anything definitive on the backspacing and offset.