My wife has started to show a little interest in riding a bike. I have a Shimano 105 (5600 serires) group set I pulled off my bike recently and replaced. I was wanting to find a cheap frame and build her a bike to get her started to see if she likes it. I found a nice frame/fork here locally but it has bosses for downtube shifters. Can I use my 105 brifters and just bypass the bosses? Or am I stuck with using a downtube shifter on this type frame?