6007LU is a 'deep groove' ball bearing type, with the ability to take axial [i.e. thrust] as well as radial load.
It's the centre bearing in the yoke that I think may be stuffed. The one in pics 1 and 2 of your above post. Is Pic 3 an end-on view of that bearing?
Its function is to press the appropriate clutch disc against the clutch pulleys, according to engagement of forward or reverse drive. It looks like it may be partially or fully seized, and to have chewed some metal off the reverse clutch disc centre spigot, thus allowing the yoke to contact the disc. This can be remedied by shimming, but there's a bit of trial-and-error involved in getting that right.
It would be good if you could check that bearing [which does look a bit rusty on the outer race] and report back.
Those linings are in good serviceable condition; I don't have an exact spec for new thickness for these, but would say 3-4mm should be in the ballpark.
