I purchased a set of Acura wheel caps on eBay for my 17" Ridgeline steelies:
part number was 44732-SX0-J010
black Acura symbol on silver background
They appear to be a knockoff product, but I kinda knew this from the eBay ad pix and since they were cheap, $32 for four.
The good news is that fit the hub snuggly, diameter-wise. The bad news is that they cannot by fully pushed in on the rear wheels - it's not the fingers/clips, it is that the center hub post protrudes further out on the rear wheels - maybe by 3 mm.
I considered taking my Dremel unit and carving out that much from the back of the disk, but in the end just installed them as best possible. If they're still there by the end of the winter I'd be surprised.
Perhaps the real OEM versions account for this difference.
2012 MDX Bali Blue Pearl Tech w/RES, Ebony interior ( Canadian model ), Weathertech Digital-fit mats