Changing your rear turn signals? British Customs has engineered a turn signal adapter that allows aftermarket turn signals to be mounted to your Triumph America or Speedmaster. Each spacer is machined from stainless steel and polished to a mirror finish. The spacers are available in two sizes, large for turn signals with a 10mm shank and small for turn signals with a 8mm shank. For trouble free wiring of your turn signals, look at the British Customs Turn Signal Harness, no wiring or splicing necessary.