If he purchases all of the parts that I listed and checks the vacuum lines there shouldn't be any vacuum leaks when he gets done. This "F81Z-4A322-AA seal" is the most important part of that system. That seal is where most of the vacuum leaks occur from.

 

Like I said already, I do not have any vacuum leak issues currently. I do have 155K on my truck. I am not surprised that the bearings have worn.