Anyone know the difference between these two front bearings? They're both 7x19mm and I don't see any difference except the price.

RBC01151-7 - RB Front Bearing:
This is a replacement front bearing for RB Concept brand engines. This will work with any RB Concept brand engine, from the .15 size all the way to the .28 size engines. This bearing has rubber seals on both sides of the bearing.


RBC01151-72 - RB 7x19mm Front Bearing:
This is a RB Concept 7x19mm front engine bearing and is intended for use with the RB Buggy 9, Series 9 and World Series 9 engines.