Info on lightweight lifters with bushings

[JIMP]

Hello

was wondering if anyone has info on the lightweight lifters (slim body style with bushing) like the ones that remmele and engine plus sells. What I need to know

they are drilled as the std T1 lifters or they are undrilled and work kind of "dry" because of the bushing material?
Dimension of the body -diameter, length?
Diameter of the base -where it seats on the cam?
Usually they tend to be harder than the T1 lifters or more or less the same?

Hoping for your answers, chhers

Friendly

Dimitrios

[Airspeed]

I only can tell you that they are indeed drilled for oiling much like the stock lifters experience in the lifter bore