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 bolt-on"

We also have fittings for specific model:

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

"Royal Enfield Interceptor 650" with a stock OE handlebar,
choose the options "Royal Enfield Interceptor 650";

"BMW" bikes with a M10 threaded stock OE handlebar,
choose the options "10mm bolt for some BMW models with OEM bar";

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

"Honda Mini bikes" models with a M6 threaded stock OE handlebar ,
choose the options "6mm bolt (for Honda mini bikes. Monkey, Cub)";

"Harley Davidson" bikes with a M8 threaded stock OE handlebar (*original bar end nut needed),
choose the options "Harley-Davidson '21 later Sportster S, Nightster";

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".

We also have fittings for specific model:

"Harley Davidson" bikes with a hollow stock OE handlebar, ID "14~24mm",
choose the options "Harley Davidson (specific models)";

"Indian" bikes with a hollow stock OE handlebar, ID "14~24mm",
choose the options "Indian (specific models)";

If it's C,

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