Dr No[Moderator Omega - Wristscan]
37599
The rubberized racing strap originally made for the first rattrapante Speedmasters twenty years ago . . .

[watch and photo credit: Nilo]
. . . is as ill-fitting as it is handsome. (The photo above is the 44 mm 2003 Speedmaster rattrapante on an alternate strap.).
Omega's racing strap fits between the lugs . . .
. . . and looks the business, but the fit is less than stellar. After shelling out close to four figures for the strap and deployant I had to get a saddle leather racing strap custom made that fortunately fit perfectly.
Basically, don't do it . . . the result is less than the sum of the parts.
Art