Kubota rear wheel lug pattern

[BTackett]

Anyone with a smaller Compact Kubota know what the lug pattern and wheel center hole size is? I am looking for an extra set of AG tires/wheels for my mitsu and mine are 6 lug measuring 4 1/2 in accross bolt hole to bolt hole and a 3 1/2 in center hole. Kubota wheel/tire combos are mainly what I am finding and curious if they would fit. Also , what is backspacing ? I need about 4 inches.

thanks,
Bill