The one on my 73 is pretty crusty. My parts guy quoted me $120 for a new one. I found a NOS on fleabay that among other bikes but mine will work on a 1976-1978 CB750K for $35 shipped.
Mine has a 5th hole for the trip nob. Do you think if I drilled a hole I can make the $35 work? they look almost identical minus the missing 5th trip reset hole.