I’ll have to check the diameter measurement but the depth looks like an easy fit. If we can’t find any bulbs we may have go the replace the entire light route but that is a last resort and we may just button up the non working light “as is” minus the bulbs and do without. We’re still looking around for some 250W halogen bulbs no larger than 5 ½” x 1 ¾” and there’s got to be someplace around that has general purpose bulbs his size. They don’t have to be “pool lights” or specialized.