I am building a new bass and would like to use a Smith Bridge for it; however, I am unsure as to the number of screws it takes. Is the Smith Bridge a drop in replacement for a fender bridge or is the number of screws/spacing very different? Also, I was wondering about the size of a smith 4-string Soapbar pickup: what are the dimensions? Is it similar in size to any other soapbar (e.g. EMG 35 or 40)? Thanks for your assistance.