Is this good value for money?

https://www.ebay.com.au/itm/MINI-REAR-R ... 2410738040

the repair kits themselves are between $25 (karcraft) and $40 (mini$port SA) each, so you're paying between $60 and $90 for the reamer and guide...

I've only ever used an adjustable reamer on them, as per Mick's how-to: viewtopic.php?f=25&t=45978

the photos are blurry, but it looks like an adjustable reamer...

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Yes, it is an adjustable reamer.
The reamer alone is available for about $30 on Ebay, which using Simon k's numbers makes it $30-60 for the guide. While that sounds kind of expensive, I could not find a reamer guide long enough anywhere a year or so ago. So we used the live centre on the lathe to keep it aligned while reaming.
I'd probably buy that kit if I thought I'd do more than one pair of rear arms in my lifetime... which I probably will.

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