Rim versus Brake size ??

Firstly, Happy New Year to all !!!
My RFGT40 is fitted with 13" DBA rotors and Wilwood 4 pot "superlite" callipers at front and 12" rotors with 2 pot (Look like four pot but do not apear crosslinked like the fronts) wilwoods at rear.
These look pretty spunky and should work a real treat when the car is finally completed.
I did not fit these brakes so am not totally sure of how standard the fitment is compared to the normal PBR RFGT40 setup.
A question I have is whether the RF's standard 16" Halibrand" style rims will fit in this application or do I need to go to 17". more importantly, would the standard offsets be correct ?
Can anyone provide the best way to measure for clearances to ensure that the correct size and offset is determined before committing to purchasing wheels.

Kind Regards,
Rick Virago

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