Thread about threads

[albertskytour]

Hi everyone can anyone tell me the thread dia and pitch of a specific 92 Toyota MR2 suspension bolt please? It has a 19mm hex head, it goes through the rear radius arm into a captive nut in the back subframe. By radius arm I mean the one that joins the bottom of the suspension McPherson strut at one end to the rear subframe at the other (via this bolt).
 Believe it’s 14mm x 1.5 pitch but I want confirmation before I buy a tap and die for it please…..