Cobra53:
Those rollers look to be from the trunion bearings that are in the sides if the rocker arm. Replace the rocker arm set, and rocker studs. A single one of those rollers will lock up the
oil pump if it is ingested through the pump screen, then you'll really have a problem. Suggest you pull the pan and clean out the bottom. The very small ends on the rollers appear to be missing from some of them. That will allow them to get misaligned and bind, perhaps creating the clicking you are hearing. You may find you need longer studs too. You've got some work ahead of you to get it right.