I'm tellin ya'..... Boca offers different grades of bearings for most engines. All it took me was a phone call, and bam! They were here in 3 days. It takes me longer then that to get to the hobby shop sometimes.
They offered 3 different grades of bearings for the engines I was doing.

I used to go to the local bearing house, until about 4 yrs ago, it was sometimes challenging at best to match exact. Oh, they could always get dimension right, but when it came to the grade, and the seal-type, it was always a question. Boca will send you catalog with first order, and some very racey stickers too. Alot of the racing guys go with the ceramics, they are real pricey though, for good reason I'm sure. I usually get the mid-range sets. Price is right with your locals I'm sure, and you get matched sets. Your not going to beat them once you try them.