Well I'm glad to see someone posting a question on this topic who's already done their homework.

I've been running 195/75-14's on our 245s having 14" wheels for several years now. It's worked out well. I think their load capacity is maybe 50 or 25lb. less than the stock tire; really inconsequential. Note that the front end of car is heaviest unless you load up the beast - and (smaller) 185/70-14's can carry that front end, as indicated by the fact that is the spec'd size for the 240 sedans.

I did have 205/70-14s on my own car before that. It's OK but I like the 195/75-14's better. The 205 version is a bit smaller diameter so the speedometer is off by a bit. Also the 205 is pretty wide for the rim width of the stock 14" steelie. The sidewalls have to angle outwards a bit more than would be ideal. Also if you get a surprise snowfall when using all season tires, the narrower 195 will bite in better.

I've been using TireRack.com
Search tires by size. Then sort by price. I usually get the least expensive tire that has decent UTOQG specs - temp, traction, treadwear. Their default sort is by "application type" or something, it's not very useful.

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Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.