Need help identifying trac bar

So I got this trac bar in a package deal however it doesn't fit my truck and I need a little help figuring out what truck it does fit so I don't p*** along parts to someone who can't use them it's for an early c10 60-64 just not sure what years I know they're different for the 60-62 and 63-64 just not sure which this is also came with a bracket it's adjustable right now it sits at 31 1/4"

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