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You are 100% sure on the year. They didnot make a LT until 1977 off the top of my head which makes a difference on stock
If a LT you need a stock off a small frame 1100 or will have to drill a small frame 870
Some aftermarket ones are universal but not all
First thing is to nail down that it is a LT. Is it stamped LT
Cheers
Check your serial number. The suffix will tell the tale. X is an 1100 20 gauge on 12 gauge frame. K is LW or LT 20 bore on 20 frame. U is 20 gauge 3" magnum LW.