Before you select a roller bearing IMS ,I suggest you consider the rather suspect method they use acquire a pressure feed to lubricate the bearing. They weaken an already suspect part- the oil pump drive shaft.
Pedos Technofix DOF oil feed is better imho.
TechnoFix DOF
The ex-Timken bearing expert(Bob?) who offers advice on the IMSB issue recommends against roller bearings in general for the IMSB replacement.He suggests ball bearing. So does Jake/Charles:
Roller Bearings
An issue that may affect your decision is the 1 row/2 row original bearing .Which do you have?