Aluminum Roller Rockers questions

So I just bought a set of Speed Pro/Sealed Power aluminum roller rockers, part # RR-7005SR-8. The set contains only rockers w/adjustment screws, and spacers for correct placement of rockers on the shafts. It describes them on the box as "steel roller tip and needle bearing trunion". Except I don't see any needle bearings, just the aluminum bores. I think this is how they mount, directly on the shaft, with the aluminum acting as a bushing material to the steel shafts.

So is this correct in how they mount to the shaft? Or do I need needle roller bearings, and does anyone know the Sealed Power part number or what can be cross referenced to work?

Will stock roller shafts work? Or what will work with these? Sealed Power has stock replacement shafts RS-626 but those might just be for the factory stamped steel rockers. The bores on these rockers measure exactly 0.875 (7/8") diameter.

Here's a pic of one of the rockers.


And the complete set with bushings that are the only accessories included.


Thanks!