What size are the standard wheels on the current SL500

Hi
I have a 1998 R129 SL500 fitted with the standard 8 1/4" X 17H2 O/S 34 alloy wheels and 245/45R17 95W Mich Pilots
I have been offered a set of 255/45R17 95W Pilots on the standard current
(folding metal roof) SL500 model rims.
Does anyone know the exact size of these wheels in relation to the offsets etc?
Cheers
Neil
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