Drop-In Rail Dimensions?

Sorry if this is the wrong forum…

Of 2 piece drop-in rails is there a comparison link or chart with outside diameter, etc. ?

I have a YHM Quad rail on one AR and don’t want to repeat that mistake, way too fat!

Not sure about a chart but there are a few threads floating around that mention outer diameters.
FWIW, if youre looking for a drop in type, the DD Omega is very slim and is free floating. A bit taller I than some I think but the narrow width more than makes up for it.

Ergo makes a non-freefloat drop-in rail that is almost identical in all dimensions to a DD Omega, including the narrow profile. I tried one out to see if I wanted an Omega, not bad at all.