The following oil filters should fit your Harley:
Fram PH/TG/XG 3614
Fram PH6022 (same as 3614 but black)
Mobil M1-102
STP 3614
Wix 51215
Bosch D3330
This is a very SHORT listing! If you cross reference among the various manufacturers, you will find no less than 20 or so different filters which would fit your Harley.
I modified the spigot on my 2011 Ducati Monster 696 to accept the same filter size as your Harley and have not looked back...
I personally like the Fram TG3614 (great filter, great quality). I am not sure if the Harley requires an anti-drain back valve, K&N application for their KN-170 does not list it but I doubt it would hurt if you had it in the filter... The filters I listed DO have an anti-drain back valve.
If you are going for the long OCI's, then of course you will want the highest quality filter. I change my oil every 1500-2000 miles so I typically go with a Fram 3614.
Here is a link to a site which has a selection of filters which should fit your bike:
Oil Filter Reference
The Fram TG runs around $5.00 at Wally World...
The general rule of thumb I have found is that you can use a shorter filter if you use shorter OCI's and the filter meets the same specs for flow rate. I think the Wix are probably the best designed, bypass on the open end, etc. but you will pay a little more... The Mobil 1 is built like a tank but will set you back around $10-$12 at most auto parts stores.
The Fram XG3614 is an EXCELLENT filter and should run you no more than $7-$9 at Wally World, however...
Anyways, make sure you do your own research but I hope this helps...
Garry
P.S. I have used K&N but do not find the brand any better than comparable and less expensive offerings and I have yet to find the difference between an automotive and motorcycle filter. Furthermore, I have not observed a filter failure as a consequence of nitrile ADBV valves and gaskets in over 25 years of riding (and driving)... Your mileage may vary, and Google is your friend...