Help with Kohler Forte kitchen faucet and Pur water filter!!

I have the Kohler Forte kitchen faucet,
http://www.faucet.com/decor/product.pl?midB921&fh=Chrome&tb=&N 3+55+219+3000353
and I am trying to install the PUR faucet mount water filter
http://www.purwater.com/#/faucets
The problem is, none of the adapters fit the Kohler faucet. The standard sized one does fit, but is not 'tall' enough. The problem is the Kohler faucet's aerator threading is deep, the adapter fits, but because the threading is deep, the adapter have very little exposed part after threading into the faucet, leaving me no thread to mount the filter.
I went to HD, but didn't find anything that would work. I called Kohler and they also don't sell any adapters.
I know there probably exist an adapter somewhere that works, anyone have this faucet or filter know where to get an adapter that's taller? The one that's too short, does fit a standard Delta kitchen faucet. I need one just like that, but taller.
Thanks!
Raymond
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http://www.faucet.com/decor/product.pl?midB921&fh=Chrome&tb=&N 3+55+219+3000353
Nice faucet. Why ugly it up with a filter? Instead of the one on the faucet, put in an in-line or under sink filter and get better capacity and no ugly blob on the end of an otherwise stylish faucet.
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The faucet is a bit too high unfortunately, and doesn't have long enough reach to put the head in the center of the sink. Washing anything results in water splashing all over the place, especially the back, since the faucet is not at the center of the sink but more toward the back. Adding the filter would definitely help in lower the faucet head, and use up my 2 boxes of PUR filters that would otherwise go to waste. ;)
Unfortunately the damn installer throw the box away, otherwise I would've returned it and switched with a regular faucet.
Raymond
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