I'm not following "loop handle" can you explain? Case gasket and seals are NLA. If the seals are the same as the 920/930 I have a set here that will work for you. For the case gasket go to the auto parts store and grab some gasket paper around the same thickness. .030 is what I've used.
I spread some 518 on one case half and press it down firmly on a flat surface. Then cut it out. It ain't perfect but it works best of anything I've tried.