I looked in Halo Pep Pack 1.7 and I dont find helmet but found some armors for it but still No Helmet. and ALSO! Yes I did use the search. it keeps show me to Mark V or Mark VI but not Mark IV anyone got that file or link for Mark IV let me know thanks
To be honest, I think I will take up working on a newer Mk IV helm, that's more rounded, and visibly close to the Mk V from reach and the Mk IV from Olah Wars. Will keep you updated, Community!