Trevor Muirhead and Neil McKenzie sent devices packed with nails that they wrongly believed were capable of exploding to a series of targets, the most high-profile of which was Mr Lennon.
The other intended recipients were Trish Godman, a former MSP, Paul McBride, one of Scotland's best known QCs before his recent death, and members of an Irish republican organisation.
Muirhead, 44, from Kilwinning in Ayrshire, and McKenzie, 42, from nearby Saltcoats, were originally accused of conspiring to murder their targets but the charge was thrown out earlier this week due to insufficient evidence.
Their defence lawyers argued the pair had posted devices they knew to be hoaxes to scare and frighten their targets but not physically harm them. One package did not have enough stamps, another smelt of petrol and a third had a wire that fell out.
However their trial heard how they had warned Muirhead's son not to walk in the direction of a nearby post box that contained the McBride device. "If you hear a bang in the night don't open the curtains," McKenzie told him.