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6K miles/light tire wear .. hmm, i'd probably would get just one. And put pair with one replaced on front. At 10+K miles or middle tire wear i'd replace pair, for grip to not differ much between sides.
Spare on front wheels? Sounds like it's not full size spare wheel like in AUDM, but space saver skinny spare wheel? Advise from manual is with reasoning to have as similar as possible wheels on cars where there is LSD diff, or it puts heavy load on it with different outer diameter wheels (even if slightly). Maybe roadside assistance didn't knew if your car has or hasn't LSD, or simply were lazy with doubled work with changing also with front wheels.
Hmm, on second thought, if you changed with space saver wheel (guessing from notion in manual of spare->front), then shouldn't you still have your blown tire? It was flat or really blew with significant damage to it? In first case, and if it seems repairable, i'd take it to the tire repair shop instead of buying one tire for replacement. Should be cheapest option, and no problems with different threads. But then again, if you called roadside assistance for putting on spare donut, then maybe your car is one with tire repair kit instead of space saver wheel or full size spare wheel, i've heard, many tire repair shops refuse to fix/deal with fixing tires 'repaired' with those kits.
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