I would imagine that if your sealed beam units are sitting loosely in the stainless/chromed retaining ring that goes around the outside rim of the lens and holds the unit in place then something is wrong there, are you sure they are the correct size sealed beam unit? If so, is it possible they are not the correct retaining rings, or they have been bent or damaged somehow?
Just that, if so, then you may have the same issue with halogen units.... and that could all get a bit pricey. If you cant work it out, it's probably worth a photo of the set up you've got, the lamps would normally sit in the retainers nice and snug of course.
I don't know offhand what size they are (I've only had to replace one from memory and it fit straight out of the box) - too dark and rainy to go and measure atm! lol
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