This is them.
http://www.fetha.com.au/
Not the cheapest option. But mine was fully custom. Great service and workmanship too. The garmin can be tilted of moved fore/aft to taste.
Looks like it only takes bolt pitch of a minimum of 22mm!
I figured that was the extension range.
The faceplate bolt distance is made to order.
Although there must be a minimum looking at the design.
@Breso started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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This is them.
http://www.fetha.com.au/
Not the cheapest option. But mine was fully custom. Great service and workmanship too. The garmin can be tilted of moved fore/aft to taste.