Any old 18mm x 1.5mm thread plug should do the trick
I made one myself at work.
Can usually find them in and around the interweb somewhere though.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.

I was wondering if you'd already had the hyperpro rear shock installed.

I'm going to do it one of these days (shock is already in the shed).

What's involved to get to the old shock, get it out and get the new one in?

Any tips or tricks that would make it easier?

HJ

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Riding the Mad Mule !! ... no more... went orange...

Firestorm, all you need now is a pair of offroad tires to take that bike to the roads where it belongs....dirt and sand