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*facepalm*
I didn't catch it at first but you measured from the front of the wheel not the back.
LOL JK
Seriously though back space can be figured from offset.
Given an alloy measures 1" wider than the stated wheel width because the flange of an alloy is 1/2" wide.
Steel wheels have @ a small 3/8" wide flanges.
The flange width being the distance from the face of the wheel to the bead where the tire sits.
Taking the 140 E wheel,684001 we would have 5.5" divided by 2 plus 3/8" plus 40mm offset equals the backspace. A whole lot easier with the metric tape,as you can see.
Anyway thanks for the 164 E wheel # I made mention of it in the showroom wheel guide on TB,
but didn't have a part number.
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71-145-S
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