1.75's work good, 4 coil them for best results. Check on e-bay and go to trapperman.com and check the classifieds. Also go to the forum there and ask this question, lots of serious coyote trappers there that can guide you better than me (I trap mostly coon,beaver and muskrat)

If I ain't huntin',I'm trappin',If I ain't trappin',I'm fishin'
If I ain't fishin',I'm wishin'!