carrier bearing drop thickness

i currently have a crap spacer lift and i will be changing it out for some billy 6112 in the front(highest clip) and billy 5160 in the rear with dakar springs. the company i got my lift from forgot my drop so im gonna make my own. wondering how thick it should be? i have two thick washer spacers from my trd skid plate left over bout 1/2 inch think if i had to guess. would that work or is it not enough to support the bearing?

 

I think the spacers sold by one are only 1/4" or 3/8" . I'll have to check mine.

 

OME spacer is 8mm, about 5/16"