Hub Bore Question (Gram Light 57maximum)

[DeltaAlpha9]

I've been googling my brains out trying to find what the hub bore diameter of the Gram Light 57maximum in 16x7 et38 is. I've tried getting my dial calipers in to check that way but unfortunately they're just to long to fit in a 16 inch wheel. Can anyone chime in as to what the actual measurements are? I need to get some hubcentric rings for these new wheels to make sure they're centered instead of solely relying on the lug nuts.

[C.Johnston]

I have a feeling it's 65mm... Rays often uses odd sizes.

http://www.evasivemotorsports.com/mm5/merchant.mvc?Screen=PROD&Product_Code=UNI-HUBRING-65-56

[DeltaAlpha9]

Looks like you are correct. I used a tape measure and got 65mm as a measurement. Luckily the wheels don't vibrate when I'm careful with seating them.