:behindsofa:
Not having a dig at you !!!:tea:
Loads of posts on the forum refer to the spanner/socket size instead of the thread diameter.
As has been posted on here, best bet is to take the nut or bolt to an Engineering supplier or motor factor at a push and they will identify the thread size and type. It will be cheaper than a Main Stealer or from Ebay.
Motor factors, Ironmongers or DIY stores tend to stock standard bolts rated at 8.8 tensile strength which are too soft for propshaft attachment-they should be at least 10.20 which is classed as High Tensile.