We don't currently have that mudguard stocked. We carry some Triumph mudguards that feature similar rolled and radiused rear edges as the A75 version. The difference is that this mudguard does not feature the indentations at the front of the fender suitable for the BSA. In the hands of a talented metal worker, it could likely be made to fit an A75, although if 100% originality is a factor, it would not be suitable. If metal work is your forte, then we'd be happy to get you more specifics on which mudguard could be altered!
Thanks for the inquiry!