Will round 1978 held light buckets work on a 1973 radiator support? Do I need different buckets

 

hey BigBruce,I think you will need diffrent buckets.That 78/79 grill projected out therefore buckets had a welded flange to kick them out.I removed today 79 buckets,and that flange is there be it round or square lights.older years lower profile on buckets.Im doing similar thing 79 cab on a 75 HB chassie that will be a 75 grill