limited slip for 71 chevy

1971 Chevy K20
Eaton rear end differential.
I cannot find my truck on their applications page at http://www.tractech.com/docs/TT-List-LTPM1004.pdf
Is there a Tractech Truetrac limited slip to fit this truck?
Do I need to switch to later model front and rear differentials? What model years would fit this old thing?
Thanks,
Vic
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You sure it's an Eaton? I've got a '69 and it came with a Dana 60 out back.
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