Unless you want to buy new doors, your best places to look is on the for sale section of this website, craigslist, and I have seen them on Ebay ( although I'm sure shipping would be outrageous for them).
Most of the aftermarket half cabs, will fit with the full sized doors.
With the half doors, you can utilize TJ upper skins (they need modified to work) But at least they line up with the opening around the top.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...