12MM banjo fitting with 3/8" barb

Hi all,

Was wondering if anyone here knows where I can get a couple of 12MM banjo fittings that have 3/8" barbs on them.  I'm converting an 87 300D to run on veggie oil, and would like to replace the old banjo fittings on the stock filter with ones that have larger barbs.  Any ideas? 

Thanks.

Eddie