Yup st24 is mrk2 mondie ,i have had both mrk 1 and 2 mondies

mrk 1 are either si24v or ghia24v , mrk 2 st24s can be both kitted and non kitted versions 'RSAP'

i have heard of some peeps st24s being stamped on the log book as si's but have full st24 kits

typical of ford and there retarded admin