Depends where it came from.

Cummins Recon one was the 292 hydraulic flat tappet.

Barton one had no catalogued specs and was not even available as a service part for the engine, I never agreed with that decision and thought it was ridiculous.
But, it was also a hydraulic flat tappet.

They came with the regular gear on the intermediate shaft.

I put a Crane street roller in my 572.