Remove the original handlebar end weights from handlebar grips and see if your handlebar ends are as following:

A. Threaded handlebar
A. Threaded handlebar - KiWAV motors
B. Hollow handlebar
B. Hollow handlebar - KiWAV motors
C. Solid handlebar
C. Solid handlebar - KiWAV motors

If it's A,

Measure your removed handlebar end weight's bolt for the bolt's pitch and size. And choose the fitment according to it.

M8 - KiWAV motors
1.25P - KiWAV motors

Here is a list of the products we carry:

“8mm bolt with 1.25mm pitch” on both side of bar end,
choose the options “8mm bolt-on”;

“6mm bolt with 1mm pitch” on both side of bar end,
choose the options “6mm bolt (for most Vespa)” or "6mm bolt with heavy weights"

We also have fittings for specific model:

“Indian Scout bobber” with a stock OE handlebar,
choose the options “Indian Scout Bobber”;

“BMW” bikes with a M12 threaded stock OE handlebar,
choose the options “12mm bolt for some BMW models with OEM bar";

“Yamaha” bikes with a M16 threaded stock OE handlebar,
choose the options “16mm bolt for some Yamaha”;

“Triumph air-cooled model” with a M5/M6 threaded stock OE handlebar,
choose the options “5mm bolt (for Triumph air-cooled)”;

“Triumph water-cooled model” with a M6 threaded stock OE handlebar,
choose the options “6mm bolt (for Triumph water-cooled)”;

“Some Moto Guzzi/Aprilia/Honda” models with a M6 threaded stock OE handlebar (*original bar end nut needed),
choose the options “Some Moto Guzzi & Aprilia”;

Table of metric and imperial - KiWAV motors

If it's B,

Measure the inner diameter of the handlebar,

Measure the inner diameter of the handlebar
Expansion

if it's “14.5~15.7mm” or "17.5~20.4mm",
choose the options “7/8" threadless hollow bar”;

if it's “17.5~20.4mm" or "20.5~24.9mm",
choose the options “1" & 1-1/4" threadless hollow bar”;

if it's “14.5~15.7mm" or "17.5~20.4mm" or "20.5~24.9mm",
choose the options “7/8"~1-1/4" threadless hollow bar”.

If it's C,

You’ll have to customize it to A or B .