When we had the Orion I upgraded to the WSL wheel bolts that now come standard on the Unicorn.
When I purchased them it came with two adaptors for removing them.
When we traded the Orion in I kept one of the adaptors as a spare for the Unicorn as only one was supplied with the van ( I thought there may have been two but I haven't found another ).
Today I checked the torque of the nuts and tried to use the adaptor from the Orion but it wouldn't fit,it looked exactly the same and fitted slightly but was very tight.
I then foolishly tapped it home with a hammer,I then checked the torque OK but when it came to remove the adaptor I couldn't get it off as it was too tight.
I had to remove the bolt and tap it of with said hammer before reapplying and torquing the bolt.
It seems strange that the older adaptor doesn't fit as I have just ordered a spare from WSL ( £5.99 plus free P&P at the moment,don't believe the £4.99 spiel,they add £1 VAT ),and they all must be the same as it didn't stipulate any different.
If I don't have a spare you can guarantee I will lose the original.