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@oxpoleon
Just my two cents, but if the cranks on the bike aren't too worn, see if you can undo the bolts holding the smaller chainring in, and use the larger one on its own. The ones on the bike are much lighter in weight (and likely better quality) than the one you're looking at on eBay. You'll probably get a better chainline too, in my experience.
Edit: If you aren't too bothered about looks, you can just leave the other ring on unused, it will be ugly but work fine.