Tim, I used to be all concerned with such things as that . When my Sugino AT BB needed replacing years ago it also had the heavy offset , and was 124mm . I bought a UN-72 127mm as it was about my only choice at the time. It was perfect, as is . No spacers needed at all . I didn't bother to measure it as it felt fine and the chainline was fine. That's the key ... it WAS fine ! If I was all in tuss about numbers I may have found some differences ,but so what ? It worked in real life. You must remember manufacturer specs are given as a reference(mostly for themselves), not an absolute as to usability. As a mechanic or customer , there is the real world application of things that work regardless of whether specs say it may or not. You having access to parts at a shop is huge plus !
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