I got them from here:
http://www.usplastic.com/catalog/pro...duct%5Fid=7413
Part numbers follow:
60695 1/2" Polypropylene Bulkhead Panel Mount Hose Barb Shutoff- 2.82 Lgt - Coupling Body
60814 1/2" Polypropylene Hose Barb Shutoff - 1.86 Lgt - Coupling Insert