I suspect that the front large bush you have is an equivalent of a usual bush hidden under rubber boot in normal shock(that Larry mentioned in another thread recently), you'll need to add all rubber bushes to these, so 4 front ones and 4 rear ones.
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.