steve-in-kville 

My Windsor Tourist has nearly 2000 miles on it. The cables all around are starting to fray and stretch. Time for an over haul. Since most of my LBS's have lousy customer service I was gonna order online. But I found that there can be various sizes when it comes to road bike shifter cables. How do I know what size to get?

I see one shop has a Shimano 10-speed replacement kit. Since I have Shimano 8-speed, would this work just as well? I take it that brake cables seem to be universal as long as I stick with road bike cables, correct?

Thanks in advance.