32 mm but be careful, only one turn in and out and then finish with a file and then give it a jolly good clean to get swarf and filings out. Don't repeatedly ream it; just to get it round and smooth.What did you ream the bush holes with John? I got my front chassis bushes out quite neatly with a tool I made up but the rear ones left the outer sleeves in so I've cut them out and there's some scoring I'd like to remove..
Was thinking about a round file and then something like this: https://www.screwfix.com/p/titan-abrasive-flap-wheel-60g-60-x-30mm/61401 but don't know if it's abrasive enough - maybe would only shift rust..
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I might give one of these a try: https://www.ebay.co.uk/p/Bosch-2609...nk-60-Grit/2134488458?iid=223001461290&chn=ps