Yes, the 6 & 3 correspond to what you want. Different manufacturers use different prefixes, so it can be confusing. I used Timken because, as stated by Iggy, I wanted a solid component on a critical application. If SKF supplies quality products, then by all means...I see they offer SKF Part # BR6 and BR3.
However, I dont know too much about quality of ?SKF?
I also dont have to order from RA if better known prices are out there.