Thanks all for your input, I have placed an order for 5 wheel nuts from Rover Parts $67 delivered, I will leave the locking one on the spare but keep the 5th wheel nut in the cubby just in case, I think the key I have for the locking nuts has maybe 1 or 2 goes left in it.

Hopefully they will be here before I leave for Cooktown in a couple of weeks.

cheers
Pat