mighty max offset

Anyone know off hand what offset i need for a mighty max with a toy 5 lug axle and front hubs on a 20x8.5?

I am not sure with an 8.5 rim but I run a 20x7.5 with a +45 off set and I had to run a 1/4 spacer to push it out. I have a Yota axel and redrilled hubs up frontI tucks like a bitch.