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Old 11-17-2020, 01:25 AM   #2 (permalink)
ticedoff8
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The 61B and the 61E do not have regulators and I doubt there is too much difference between them. So I would expect them to be compatible on the 91 & 105.

The OS 61B-PSII does have a regulator and came on the OS 91HZ-PSS
The OS 61G comes on the 91HZ-R Speed and the 105HZ-R
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