If you have a 25mm wide strap, you need to buy a 25mm loop. Heavy Duty, High quality finish.
40mm Belt Buckles – 19 Styles in Nickel Plated, Solid Brass Silver & Solid Brass
CS Osborne Nickel Semi Professional Eyelet Kit Nickel Plated Solid Brass Eyelets
CS Osborne Home Use Nickel Eyelet Kit (Nickel Plated Solid Brass Eyelets) K231
Brass D Ring Loops 50mm - 2 Inch Solid Brass Nickel Plated Heavy Duty
Solid Brass Dunham Full Belt Buckle For 1.5" - 38mm Wide Strap Brass or Nickel
West End buckles Solid Brass Nickel Finish 9 Sizes