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The black one I'd replace, both of them, it's not really a good idea to mix a new and a worn one on the same journal. Left in I think it will end up scoring the journal surface. The black shell can only have come from either number 2 or number 4 journal, as the ONLY combination to use a black shell is a C2. As I said though, finding black shells is difficult, 13315-323-000 is the part number, CMS did have some months ago but they've gone now and they weren't cheap when they were available, they are showing them as selling for £11.25 or so but I can guarantee that when they were available they were a LOT dearer, I think they reduce the price of the part when it sells out so that they can buy someone else's stock and claim they aren't worth as much. Sure they were close to £28 a shell when they did have them, plus P&P of course. I'm not keen on the state of the rest of the shells TBH, that scoring on the upper edge is worrying, not sure how long this engine may have been stood but to me the surfaces of the shells look contaminated and that's why they are starting to break up. I'd replace all the crankshaft ones if it were mine, I'd also check the rods shells just in case. £230 for both or each?
Look for markings on the crankRod shells are getting rare, especially the black and yellow ones.
Make sure the conrod surface where the shells sit is nice & clean - then I would Plastigauge all the bearings this gives you an accurate clearance measurement for the journals that you can check against the manual tollerances charts.
Also, I measured the crank journals for the main bearings. My case is BCBCB. I got these measurements in mm:1. 32,962. 333. 32,954. 335. 32,95Does these numbers make sense? The shop manual only shows this in inches - does an official source with metric measurements exists, that I can use to determine what color bearings? The colors I pulled out, from 1 to 5, was: Brown, Green, Brown, Green, Black