It’s often the case, it’s pretty rare that a manufacturer will have parts like this especially made, it’s to expensive, they just try and work around what their suppliers already produce whenever possible. Funnily enough I’ve just discovered that my Honda VT1100 shadow tourer & my wide glide share exactly the same 41mm Showa forks!! I’m upgrading the suspension on both bikes, progressive springs, cartridge emulators yada yada so was doing the usual measurements when I realised. Handy cos I just had to order 2 of everything.