I bought my CX500 off my Dad in 1985 and gave it back to him in excellent order as a Christmas present in 2005. He loves it to bits and rides whenever he can. Trouble is the cold weather is getting to him and he can´t get on with handlebar muffs, so I´m looking to get him a set of heated grips for his birthday but don´t know the handlebar size. I suspect that it´s 7/8\