You should fish out the old one. Because it will chaff through your tank. Not right away but it will (Replace a customers tank for this reason). I used a piece of aluminum T.I.G. filler rod, went through one hole and the light through the other and fished it out. That is how I have gotten them out before.

...and pray the piece didn't sneak past the baffles otherwise you going to need more then a piece of welding rod to fish it out!

Did you get some made in alum?

No havent gotten one made yet. fountainICBM and I have been talking and it sounds like he can make me one.
I am planning on getting the old one out just figured that was a job better suited to when I get it home and have plenty of time.

like the tig rod Idea. Thats a good one. I was gonna go With a coat hanger since I have the super capacity tank in my boat.(of course)