roof marker lights question

[hugger724x4]

which type of roof marker light was aval. on the 10-20 series trucks? i have seen 2 types. the 1st type is these, which would bolt on to any cab. and then there's these, which required a special cab where the roof was molded to accept these lenses. the ad says for 50-60 series but i have seen these on 10-20 serious (i believe). i have a 72 1/2 ton 4x4 and want to put the correct cab light on it. any help is apriciated. thanks!