What would you guys do???

[74bowtie]

I sell a little on ebay, I recently sold a posi unit on there to a man. I told in the auction wat the original ratio was which was 2.56 and I mentioned you could get just about any ratio you wanted in the aftermarket. Now he emails back saying it won't work for him he has 3.73 ratio and they won't work. I have already responded with ,I gave all the information needed to make sure this unit is right for your application plus sent him the part # for the Jegs gear set that will work for the posi unit. I have nothing back from him as of yet. What do you guys think.