I bought this one for my spare (245/70r18)
245 70 18 GOODYEAR SPARE - New Takeoff 245/70/18 - Spare for 275/65/18 GOODYEAR | eBay
Currently running stock sized Defenders and Blizzaks and both sets are on their last leg, so upsizing this spring and will mount the new spare then when I switch to 265/65r18. The calculators state that 245/70r18 is 31.5", yet the seller (9 still available) state they're off trucks that had 275/65r18's which is 32.1". Though, if those were 2wd capable vehicles, it wouldn't make a difference.
Net is ... at $31.50 a tire shipped, I'll take the chance. Believe the tire had a manufacture date of 32 week of 2019 on the one I received.