When buying a replacement square taper bottom bracket, it needs to be the right size and threading for the frame and the spindle needs to be the right length for the crankset.

Matching the frame is the easy part. Your KHS is going to be English threaded and the frame's bottom bracket shell will be either 68 or 73 mm across. Just measure it with a ruler to confirm.

Matching the spindle length to the crankset isn't quite as easy. You may be able to look up the required spindle length for your particular crankset model. Or you can remove the crank arms and measure the spindle length with a caliper.

Once you've got the threading (English), shell width, and spindle length, it's time to go bottom bracket shopping.

Shimano UN55's are my usual choice because they're well-made, inexpensive, and readily available. If you don't want to use Shimano, Tange also makes high-quality gear and their LN-3922 bottom bracket is solid. IRD sells bottom brackets made by Tange under their own brand name, so those should be another good option. Origin8 bottom brackets are also available, but I have no experience with them. Someone else here on the forums mentioned their Origin8 bottom bracket came in a box marked 'TH Industries', which is FSA's parent company and a reputable company.