Ya 41 tubes is it. I have a set of Baron marker/signals up front which mounted around the tubes between the upper & lower tree. There are quite a few out there that are made to be located around the tubes it just a matter of what ya like.
here is a link to jp cycles catologue, if you go to the top left youll see the ones I am talkin about part #3300556. I would always order extra lenses knowing what I know now.
Check it out the Joker machine ones are nice too.