Listed as being for EXP, but might work for 1985 & 1986 trucks?
Great price!
https://www.ebay.com/itm/NOS-Ford-1985-EXP-AM-FM-Mono-Radio-E5FZ-18806-A/232978227749?epid=1655757851&hash=item363e95a225:g:7XgAAOSwX~dWqEPG:sc:USPSPriority!40475!US!-1:rk:13:pf:0