1540X & 2730Z balance

A quick learner says:
I have a 16" series 380 balance with stamp "1540X" and a 28" Series 380 balance with stamp "2730Z". Are the replacements simply "1540" and "2730" respectively?
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Donna from SWISCO responded:
Yes, choose stamp option 1540 for the S380-16 and choose 2730 for the S380-28.
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