I have a Citizen BM8180-03E with 18mm lugs, and I bought these straps for it in 18mm width. The straps look great and they seem very durable, but unfortunately they are slightly too wide, so it was very difficult to install them. I was eventually able to get them on, but if they were .5mm narrower that would be good. If you have a BM8180-03E I would recommend a different strap.
I wish I would have found these watchbands sooner.
Sharp looking and well made......I will be ordering more