We have to evaluate case by case. For some stoves (Like PF13S130) you can just buy the long legs and adaptors. But for some stoves (Like PF13S160EI), we have to make short leg adaptors before long legs are possible. For the later kind of stoves, we typically do not make their short leg adaptors when people just order the short leg version. This becomes infeasible to adapt to longer legs at a later time provided that the customer does not want to send back their stove for modification.