The standard leads have funny ends to clip onto the distributor cap, as many late model Toyotas have. These don't fit a generic coil like the Bosch.
So you just have to use normal leads at the length you want. The only problem is that you loose the nice rubber fitting around the spark plug tube, which is ok, but it means you can't get the engine too wet.
The only solution I know is get custom leads, maybe send a old 20v lead to TopGun or someone like that.
OR, ditch the Bosch coils and use Toyota coilpacks off a Rav4, Camry, or Spacier, or HiLux as those coils have the same fittings as the 20v plug leads. That way you can keep standard 20v plug leads, but you just have to mount the coils very close to where the distributor cap would have been.