Keep in mind that for a WINTER tire, you want a NARROWER section width. A 215 would be a better choice than a 235.
The narrower width will help the tire cut through the snow and get down to the pavement, whereas a wider width will tend to ride more on top of the snow. Think pizza cutter vs. rolling pin. This is especially so in states around the Great Lakes, upper Midwest, and western mountains.
Then a 205/75R15 would be an even better choice [for deep snow] than a 215, yes?
205/75R15 WAS [originally] an OEM option for '91 Caprice sedans with the 4.3L LB4 V6 or the 5.0L L03 V8.
FireStone WinterForce 2 (studdable, if you're into that). $79
215/75R15 quickly replaced 205/75R15 in '91.
FireStone WinterForce 2 UV (studdable). $96
225/70R15 eventually replaced 215/75R15 in '94 (and substituted when 235/70R15 was not available on 9C1s).
Yokohama GeoLandar I/T G072. $104
225/75R15 was for wagons that LACKED V92.
FireStone WinterForce 2 UV (studdable). $99
235/70R15 was the OEM upgrade option for all cars equipped with V92.
Yokohama GeoLandar I/T G072. $101
235/75R15 (not a misprint) was OEM for Cadillac Fleetwood limos (V4U), nevermind light duty vans, and '1500' pickup trucks and SUVs from 1971-2000.
BridgeStone Blizzak DMV2 costs a bit more, known to squirm a bit at highway speeds, may not be the best in really deep snow. $138
Michelin Latitude X-ICE XI2 costs a bit more, and is probably not worth it. $141
FireStone WinterForce 2 UV (studdable). $107