That may depend. Typically the master cylinder fittings are not the standard size you get on a piece of line. In that case you will need to cut the old lines to get the fittings off and then cut the new line, slide the new fittings off and the old fittings on then double flare the ends of the new lines. Double flaring tools aren't too expensive and you can practice on some old lines to get the hang of it but it's really easy to do.