hi
there is an option if you think out of the box
you need these parts
hb61472 x2
hb75188 x1
hb61470 x1
hb61530 x1
a few shims and a bit of ingenuity to get from 10mm to 19mm on the bearings. oh and a big grin when you try it for the 1st time. it's fab indoor
way too much on grass, not tried on astro yet but i think it will work well.
cheers andy