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The other printed stuff is...
Shimano's part number: BB-UN26
Thread pitch and size: 1.37x24
Spindle width: LL123
BB cartridge width: 68
Diameter and thread pitch is all standardized for these unless you have some weird old French bike or something. For your 2000s era bike, the thread pitch will all be the same between those square taper BBs. The 68 is the width of your BB shell, and the 123 is your spindle length which ultimately sets the distance between your crank arms. Changing either of these will either make the BB not fit the frame, or will cause your chain line to be off, so you want to order the correct BB with those numbers. It is a good idea to clean the old threads a bit with some degreaser and a rag before threading the new BB in. Your new BB may or may not be the exact same tool to install it, so be aware of that, but again they are very common, so you should be fine. You're doing better than 99% of people out there in just being able to thread out the old BB since one side is backwards threaded, haha.
Good luck!!
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1984 Porsche 911
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