That terminal connector is called a weatherpak connector. It isn't a stock Jeep item, and therefore you are having difficulty finding it.
This is what you need. www.performanceplusconnection.com/Item/WPK_1_16_14
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...