I tought it was 5.00 x 5. Only the mains use a 6" wheel. just working off memory, so double check me here.
I would consider wilkerson instead. Used to be a loyal Dresser customer, but VSE has ramped up the prices pretty bad, like most aviation supplier acquisitions these days. Just ordered retread mains for the 10 yesterday. Dresser $150 - wilkerson $100. Just don't understand how these guys expect us to not shop their prices.