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That site should have clamp sizes that you want. This one has them as well

http://www.diywake.com/shop/shopdisplayproducts.asp?id=72&cat=Wakeboard+Tower+Clamps

They should be 6.5 and the polks should fit. with out seeing any pics would be helpul in confirming size, but i understand your distance dilema..

check out this site on ebay has a ton of cool...

I am pretty sure it is 1 5/8. from the 2002 manual there were only rad- a cage towers

goto at the top of the page.. about moomba. archive. 2002. outback ls and download the manual

here is...