Found these on Ebay

http://cgi.ebay.com/ws/eBayISAPI.dll...ht_3109wt_1413

I bought 6 and 36 filters, you won't find a cheaper price on a bypass filter. They have a metric thread but I just drilled the thread out and retapped to 1/4 NPT so hoses are cheap too.

If you value your motors this is a cheap way to prolong their lives......