Green Bearings and Studs?

Like I stated in another thread I bought a set of Yukon axles. What size suds are you using? I was thinking of going with 3"! Any draw backs with going that big? Also the stud hole is 0.645 but it doesn't seem any one offers studs that size? I know I must be missing something because I know there are quite a few guys using these.

Also where did you get your green bearings from other than Mancini and Summit?