Ralph wanted to use one of these electronic relays on his '76 Z900 special, but there was not a suitable bracket on the bike. He then designed one and made it on the 3D printer in strong and durable PET G plastic. It then occurred to us that maybe Ralph isn't the only person who could use such a bracket, so we did a short production run. The relay is necessarily a tight fit in the bracket so isn't the easiest to fit, but were it a loose fit there would be the danger of it falling off. If it is tricky to get in you could make a light chamfer on the end of the relay case with a file or emery board. The mounting hole is 5mm. If you need a 6mm hole, as Ralph did, just open it up with a 6mm drill. If we made it a 6mm hole then using it with 5mm screws/bolts would not be ideal. If you are buying a relay and this bracket and want us to fit the relay just drop us an email. If you want an M6 hole we can also open that up before posting.