40mm cases are 22mm - Common sizes 22/20 and 22/22
44mm cases are 24mm - Common sizes 24/22 and 24/24
47mm cases are 26mm - Common sizes 26/26
Rads are generally 27mm - Common sizes 27/20 for Rad deployants and 27/22 for Luminor Deployants/buckles and 27/24 for historic buckles
OEM size lengths are 115/75 Stnd, 115/95 XL, 115/68 XS, 98/68 Ladies
Luminor Deployants fit 22mm
Thumbnail buckles fit 22mm
Historic Tang 22mm & 26mm (PAV)
Historic Buckles fit 24mm (MX) These are only available already sewn in)
Rad deployants 20mm