I put an 2006 Softail tanks on mine with the same color on my sporty and it works fine. It takes a little moving things around but it can be done. I love it... I can now cruise over 350KM or more on it. Depends on the driving conditions. (That's the main tank and I still have the reserve on stand by) The benefits beside the extra distance, it also lower the centre of gravity.. I can take tighter turns and is not as tipsy. Good Luck!!
PS. If you lower you sporty... make sure looking into moving your wire on top of the fender.. mine got shredded . I have a aftermarket 1 inch lowering kit on a 06 XL883L installed.