You can get a reversible screw-on MATIN type from evilBay. Hood is black moulded plastic with metal male/female threaded ring so you can also screw-in 72mm filters/lens cap. I bought one for my black Minolta Mk 1 AF 80-200mm f/2.8 APO a couple of years ago and it looks fine and did the job.
Pretty cheap option too at under £10.00 delivered. Just do a worldwide search on the Bay for MATIN 72mm hood.