Who told you they should be 32mm? USA models of R100GS had 32mm but I didn't know they had them elsewhere. The part number is stamped on them so you can visually check that to see which ones are actually fitted to yours. as far as I can recall they were 40mm on that bike Jim and my current German R100Gs also has 40mm. perhaps some wires crossed in translation with whoever told you 32mm?
A similar confusion when ordering carb springs from USA led me to know this info, the hard way, hence pair of EZ springs for 32mm carbs being flogged cheap by me at moment. Perhaps the bod on phone thought you were in USA or that they were in USA?