upgrading from 28 to 31 spline axles & I have a question

I have decided on a Detroit Locker to replace my worn out limited slip differenital. While I am at it, I figured why not upgrade from 28 to 31 spline axles. I had new brakes installed when I got my global west suspension and I see from the bill that I had brakes for a small bearing rear axle. However, when looking at new axles at Summit's web site, I don't see any specification for large or small bearing on the axles. Does it not matter? Will I have any fitment issues with respect to my brakes? What do I need to order in addition to new axles, bearings, and seals?

My question is now answered. It turns out that the summit catalog (both in paper and on-line) is limited and does not give me the info I need. These axles can be had in the desired spline and with either large or small bearings. I have found out that 35 spline axles and lockers cost the same as the 31 splined ones so why not go up? As for the clunking sound, I can live with it.