The bush comprised two steel tubes, vulcanised to the inside and outside of a rubber tube. The outer steel tube is a press fit into the eye of the spring, and the inner, compression tube, is a close fit on the shackle bolt, and kept from moving by the two cheeks of the shackle or dumb iron being clamped on the ends. The bolt is a standard one, BSF originally on that vintage, but can be replaced by UNF as it is not tapped into anything. Bushes after the 80" narrow spring models are readily available as they remained the same up to Series 3 (except for the chassis bush on the front spring that changed for Series 3.
The bolt will be seized by rust onto the compression tube in the centre of the bush. If you cannot free it by repeated heat plus petetrating oil, there is little downside to using a thin cutting disk to cut the bolt and compression tube both sides of the spring, taking care not to damage the spring or the dumb iron.
You can assume the bush will need replacing anyway, and the bolt probably would as well.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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