Hi Mike,
Tire Rack has a listing for seven different models in the 295/50-15 size, made in six different brand names. They list two BFGs in the 275/50-15 size.
What worries me ( and should worry you! ) is that not only are they an "S" rated tire - read "lowest speed rating" - but the narrowest rim BFG recommends is 8" for the 295s, and 7-1/2" for the 275s.
Where I come from, putting these onto a 7" rim might constitute some sort of death wish...
You might be better off with some 245 or 255/60-15s at least for the rims you have. Still not a good high speed tire, though.
Tom