I recently ordered a Crank bolt from ..parts.com (i think) Korum Mitsu in WA. The improved bolt has been superceded by what looks like a hardened vertion of the caravan bolt.

It's short but installs just fine with a standard 6" extention.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.