what should I use?

[chuck1764]

I will be replacing the bushings and pins in my backhoe and i need to know what steel to use for my pins and if i will need to heat treat them? The bushing will be 2in DOM C1020 steel with a bore of 1.5 I have access to 1018,1045,1117 11L17,1215,A-36 steel for the pins.I also need to know how much clearance i need between the two.