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They are the same. I have swapped my Arlen Ness Big Sucker Stage I from my '07 ultra to my '05 Fat Boy (which has a SE Stage I)for a short time. Same size, same bolt pattern.
Steve - I don't believe the backing plates have changed for '07. I just bought a SE Heavy Breather kit and it fits 00-07 (except MM injected touring bikes from 99-01). I can take a pic of mine later if nobody else can confirm with certainty.
The 18-507 is for $127, while the 18-501 is $107. They are identical but they say the 507 is for the 07's while they say the 501 is not.
I have the 501 on my bike now, and I'm getting ready to do some installs on an 06 and an 07. I need to order the parts, and I'm trying to get the best deal and not get ripped off for $20 is the 501 will fit.
A timely post as I was wondering the same thing. I did a search on here and found some info stating in 2006 there was a change and the bolts are not long enough to use a 2005 and earlier Arlen Ness air cleaner on the '06's and '07's.
I have an Arlen Ness A/C part number 18-500 that I bought for my 2005 Softail. I traded the softail in for an '07 Electra Glide Classic. Eastern Performace is selling this same air cleaner on ebay stating it fits'00 to '07 bikes. I can't really find a difinative answer.
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