1988 ford ranger power booster

First generation Rangers 1983 to 1988 for body panels, mechanical parts may stretch across a longer time period, just watch out for major changes like drive by wire, OBD1, OBD2, electronic shift, etc.

Sorry just saw you were asking about a power booster. Check any local salvage yard, they all maintain an Interchange Guide, tell them the part you need and they'll find it in their or a neighboring yard.