AC Hose Clips for Plenum for connecting flex hose 73" 240z

Does anyone know where I can get a dozen attachment clips that go on an aftermarket plastic plenum hole in order to attach 2 inch flex hose.  I would prefer no flex plastic ties since they tend to come unattached to the plenum hose after a while.   The small clips have a slightly upward backside that once you install the hose over it, the hose is restrained from coming loose.

This is for  a 73 240z that I am restoring.  I have tried many companies to no avail.  Unfortunately the ac is no longer madeso getting them from that company cannot be done.   

Thanks