If not familiar then it may help to know that they have nice thick rubber bushes to sit between the fork leg and headlight bracket - helps to identify parts if auto jumble rummaging. Cb550 ones look different to cb500 but should I think physically fit the space. Plenty of generic after market ones out there that would get you on the road, but most are frankly poor quality and ugly. I've not used aftermarket ones in about 15 years after getting fed up with wasting so much money on stuff that was either 50% more hedious than it looked in the catalogue or fell to bits. Personally I quite liked the look of my slightly ratted looking original headlight bracketts, chrome mostly polished up ok but round the corners you could see the rust and where a split had started by an indicator stem, I braze welded it and just cleaned up with a scourer afterwards - you could see the repair if you looked but on a well used machine it looked ok. To me bikes that look like that have their own charm, and its surprising how good pitted chrome can look once polished up. Ok, never going to win a show but parked in a row of classics at your local car and bike classic show it will draw attention as a nice un restored bike. I've seen mine getting as many viewers taking photos in the cast park outside as bikes in the show when mine was my daily rider.