can you share the megan kit your reffering too? i have not seen the double adjustable ones. except there McKinney ones.
the ones on ebay claim to have adjustable ride height, but in the fine print they say that it is single adjustable, the spring perch moves and thats what they call adjustable ride height. wich is misleading i think.
as for the tube diameter, maybe mikes right, but i havnt had any luck using 2 inch stuff on 240z struts, or 260z struts, wich appeared to be 2.25 diameter.