99 brakes

So i decided to take apart my brakes today to measure the lug because after glancing at some threads, that seemed to be a determining factor. But now I can't find any specific information correlating lug length to cast or composite rotors. I need to order hubs and brakes soon and wanted to know which I have. The lug showed to be 38.5mm from the flange to the top of the lug, and 35mm of threads since the threads started about 2 and a half mm up. I was looking at pics and if seems that the composite rotor hubs have shorter lugs than this? I just want to make sure before I order the parts.

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The correct item to measure is the rotor, or the height of the ring around the 36mm nut on the unit hub bearings.

See this in the FAQ section -> http://www.naxja.org/forum/showthread.php?t=1058413