215/65R16. Same size as the second generation Toyota Sienna 16” option, second generations CR-Vs and base Mustangs with the 4.0L Cologne/3.7L Cyclone V6s. I checked for a set of used tires off eBay in that size. It’s almost a wash.
I think the shop used Blue Devil or Bar’s Leak. It’s one of those that doesn’t require draining out all the glycol/water mix.
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A few different all-weather tires are $77 each in that size:
Prinx Hiseason 4S HS1
Fortune Climaflex 4S FSR402 (also made by Prinx, likely the same as the Prinx 4S)
Summit Ultramax 4S
The Hankook 4S2 is $96
The Nokian Nordman Solstice 4 is $109