Gary· Senior Freek
I don't see any pictures of your models, nor the model number for the second model. Typically when sizing straps, you simply need to know the lug width. Things sometimes get a little trickier with bracelets, but the main thing is typically knowing the lug width (not knowing either watch, I can say that most lug widths fall in the range of 18mm-24mm. Even sizes (18, 20, 22, 24) are usually easier to find than odd sizes (19, 21, 23).