Green bearings or stock adjustable

Stock bearings are readily available through bearing distributors like Kaman. They are generally sold by bearing number, not application.

There are a lot of opinions but it's basically engineering. Are you driving the car more on winding roads or at the drag strip? Green bearings are designed for straight line use. Some manufacturers even put a disclaimer on their product saying "not for street use". There are always a hundred people who will say that they've been running them on the street for hundreds of thousands of miles with no problems. Many enthusiasts only drive their car to shows and at the dragstrip and green bearings will hold up fine.

But should you decide to get in a road race? The simple fact is that side stress is a destructive factor in straight roller bearing design no matter how well reinforced it is.. Hold the two bearings side by side and look at them: When you go down a winding mountain road at 100mph, you are putting stress on the side part of the green bearing that it was not designed to take.

Tapered roller bearings, on the other the other hand, are specifically designed to handle this side stress as a function of it's intended use. On the curves, the bearings are forced into the tapered race, minimizing the stress and the likelihood of failure.

It is a PITA to keep the adjuster and lock working and make certain that the sure grip unit has a thrust pin in it, so green bearings are easier, but overall OEM bearings are much safer.