If Takasta on ebay AKA itaktech.com doesn't have feet for the particular model you're looking for, it's probably the case that Hotline Games are not producing it. You can buy smaller feet (ie3.0/g1) since they're compatible with most mice, or in my opinion, just use the default feet because most of the time the difference in glide is pretty minor.
About the bungee : you get it from amazon or aliexpress. I don't think Takasta sells them either.
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