Rocker Shaft Hold Downs What Ones?

Professor Fate said

Rock Auto, but like so many things right now, it's currently out of stock.
More Information for ENGINETECH HK108 (rockauto.com)
Might be able to use the part number to source the kit elsewhere, though.

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Sorry I should have said "Better Than Stock" I have some from an old 340 here.
But hate to use them.
422" stoker 10.88 to 1, Eagle Crank & H Beam Rods, Diamond Custom Pistons, Custom Ground Solid Cam, Ported Edelbrock Heads, Comp Cams 1.5 Roller Rockers.
All ARP, would just get studs but they just show Studs no Hold Downs.
Hughes shows out so does Mancini on the Hughes.

Rocker Shaft Hold Downs
So asking what Brand Type? Thanks