Correct Throw Out Bearing?

[AMXguy]

SKF offers a standard and a self aligning throw out bearing assembly. which one is correct for a big block with an 833? I don't remember ever being asked which one I wanted.

[Moparal]

One with the collar and one is just the bearing I think. Is one priced higher than the other?

[Chryco Psycho]

there are 2 , the 23 spline is smaller
the "big block" 18 spline is a larger brg & about 4 times the price

[AMXguy]

They both have the collar, and the specs say they're the same size. the only difference is one says self aligning, and cost twice as much. I don't know what self aligning means unless it's a type of bearing that can pivot on the race? we'd call original would not be self aligning I'd guess?

[ntstlgl1970]

The self aligning is just a newer bearing technology, the thrust surface of the bearing can "self center". Either will work fine.