I tend to avoid West for hardware except in emergencies, as one never knows what alloy is in the bin and prices are absurd... I've been bitten a few times with crevice corrosion from 18-8 or other cheap stuff. The best fastener and hardware source I've ever found is
McMaster-Carr, which ships quickly and has just about everything imaginable for industrial supply... if you click "hose and tube clamps" in the first section, it will show the options (including those with all-316 hardware for maximum corrosion resistance).
Cheers,
Steve