Actually, funny you should say that....I bought an 2011+ dipstick tube a looonngg time ago because even before the LML's first came out, I immediately noticed the driver side dipstick tube in those underhood spy photos that were floating around.
So as soon as LML parts first became available from GM, I bought one...I quickly tried it in a truck that didnt have an engine in it at the time, so I wasnt really sure about the final fitment...but it didnt look like it was going to be a direct swap, so I forgot about it, threw it in the corner, and never mentioned it/asked about it on the forum.
Ill dig it up from the junk pile and try it out again, after making the modifications you mentioned...thanks Shane!!