replacing 8.3-22 tires w/ 9.5-20

[macattackga]

I have what I think is an L2000DT (3 cylinders / 4 speed PTO) with 8.3-22 tires.
One of the wheels is so badly rusted that the bead looks like it will let go.

I've been looking for some R1 12.4x16 wheels/tires (what came on the domestic market tractors).

I stumbled upon (and bought) a pair of 9.5-20 wheels/tires.
New wheels appear to have a 6x6" bolt pattern w/ 4.75" center
My tractor appears to have 6x150mm bolt pattern w/ ~4.5" center (probably metric)

Any thoughts on getting new wheels installed?
Drill new holes?
Bolt pattern adapter?
Keep looking?

Thanks!

PS it is a 4x4 tractor, but I think I've got the right ratio/size:
8.3-22 are 37.5" diameter
12.4-16 are 37.6" diameter (assembly part number ABR9382)
9.5-20 are 37.6" diameter


If I get this sorted, there will be one decent 8.3-22 wheel/tire available.

 

[North Idaho Wolfman]

Cut out the center of the old rims.
Weld the old rim center over the new rim 1/2 way between original holes.
Drill threw holes in old rim center, cut out center hole to match old rim center.

Don't rely on diameter to give you the answer if a tire/rim combination will work, you need the RC (Rolling Circumference) #'s to match.

8.3-22 = ~109RC
12.4-16 = ~106RC
9.5-20 = ~112RC

So while the Diameter # looks like it's a match the more critical RC # does not.
But in this case it is close enough that you should not have an issue.