Cab door hinge

I need a new passager door the van is. 75 with 15mm hinge pins how hard is it to convert a later small pin door to fit

 

I bought a kit , probably from JK .
Problem is , i can`t remember if it was to convert late to early or early to late . It`s easy IF the kit goes the right way ....

 

It goes both ways , the hinge is the hard bit