So.. I've been thinking for some time that I would like to buy a Mustang II front suspension for my 69 SWB. So finally I begin to get serious about it and start calling around and people are now telling me this will not fit

if this is true... wait.. is this true?? If so is there some kind of direct replacement or something.. I wanted a better front susp. Am I chasing after something that is not there?? Any suggestions?
Thx