I dont know anything about Laurel Parts but one clue is if you have 14mm coilover lower mount to knuckle bolts, then its likely the same as S14.
You have a Nissan 5 lug hub or conversion aftermarket hub?
the exact issue though on the FLCA is the taper angle. so if you have a known 13 or 14 FLCA and test it on the Laurel knuckle, and the taper sits correctly (really sits firmly without being bolted on), you have your answer
its nissan OEM hub i dont remember exactly about the bolts. Do i change them or not. It was a long time ago. But i remember that i`ve changed the stock s13 ball joint to an R33 ball joint to fit stock s13 LCA on that C35 knucle. And i dont remember why exactly, but it seems its because it wont fit correct. So if i understand it correct s13 ball joint is thicker than s14 and thats the main difference between the pbm LCA combo? and i need to realize what kind of ball joint is correct for my C35 knuckle. also C35 almost=S15 in suspension so i guess i need s14 one.