Affordable Vac ADS

I have an X4 ADS and the "comfort" strap and noose do not work for me. I’ve even tried the velcro mod, and I think vacuum is the way to go.
So, I’m going to buy a vac attachment like this one from autoextender, the "modified vacExtender v4"

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I understand it’s a good product, but $129 for like 8 ounces of plastic is steep. Is the vacuum head attachment and white plastic extender mod piece sold anywhere else?