New Headlight/bulb kz750

Just got my 1982 kz 750 twin csr M1 back from the shop, love the bike only 6755 miles on it, got it off e-bay for 1060.00 put $866.62 into it runs great, however the highbeam only works have not purchased the service manual yet, my mechanic says I can put a new light in. My question is? Do I need a whole light or just the bulb, and where to purchase it. I dont care about cost need the low beam fixed to get my tags asap.

Just go to AutoZone or WalMart or anyplace else that sells auto parts and get a 7" round sealed beam. I suggest a Halogen sealed beam headlight.