Need side steps

I was wondering if anyone had information on a company that manufactured bolt on sidesteps that would fit the following?
Manufacture: GMC
Yr. 1987 Model: V1500 4 x 4 Eng: 5.7/350 Trans: 700R4 Std. Cab
I am only able to find companies that list them from 1988 to present. Thanks in advance. K
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