I had a look at the cam followers and there is no sign is any clips/springs/internal pistons. I also put some oil in the 'cup' and it syphoned through the hole out the two holes on the oposite sides. I think we can safely say that these are solid lifters?
As to the PRs, I measured 4, and all of them measured 281mm (
). I can only assume that these are rods that started their life as 282's and wore off a bit?
Hope this helps.