Get rolling again

[Aussie Boy]

I have a 65 C10 in storage at a friends yard. The tyres on it are shot but all the stores I have been to say they don't make the 10-16.5's I need anymore.

It's a 6 bolt pattern (sorry I don't have more details, the truck is on the other side of the city) are there any suggestions on what other rims will fit to get some tyres fitted to it moving again? I want to get it to my house but the shops all want to sell me brand new rims and tyres for $800. Just after some knowledge before I go running around wreckers or shops again.

Thanks for sharing your knowledge!