Juan - you don't replace tires in 3s. Demand a fourth tire. There is no reason not to.
Good luck with the fix. My car was in for six weeks with the work they did.
I would also recommend a *serious* inspection of the transmission - or just outright demand a rebuilt unit from Vertex (that's what I did). The insurance company is faced with a $2000 bill to crack the tranny open to look - and you know with having the rear quarter hit that hard, there's going to be some tranny damage. They'd rather just replace it with a $1000 rebuilt unit from Vertex.
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Mark Szabo
1986 911 Targa 3.2
1987 Escort 5-speed 1.9
RIP
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