The throttle tube is why the right is bigger than the left.  Matching the throttle tube is the important thing.  There are 100s of 1” options out there.

99% of the options out there come with the right grip pre-installed on a universal/generic throttle tube.  The grip can be removed (carefully with a skinny flat blade screw driver and some WD40 or silicone lubricant) from the throttle tube and then you can install the new grip on your existing stock throttle tube.

It took me a couple purchases to find grips that had a universal throttle tube that was a really close match to the stock throttle tube.  I don’t know if I saved a link to the set of aftermarket grips that worked (throttle tube matched up good) out of the box (from Amazon).  I’ll look.  I have a set of stock grips in good condition that I can sell if you are interested.  You probably want something new and more custom or comfortable to go with your “Z” handlebar, but I thought I would throw it out there.

The throttle tube needs to accept a 6mm “barrel ferrule” on the throttle cable.

A blower would probably help. I replaced the rubber tip with 1/8" brass tubing on one. It'll put a blast of air down in a hole and launch stuff right back in a guy's face. Go ahead, ask me..

Full disclosure

Requires compressor. Or an adequate volume of compressed air.
Just having a blower will not do the job.
Lawyers,, ugh

If all else fails you can always try the Ol' HawkTuah..

The HawkTuah method leaves a sticky residue...