Re Threads. The Series 1 was built entirely using BSW and BSF (plus selected BA and BSP).
Series 2 replaced the BSF with UNF - for new parts compared to Series 1. Through Series 2 and 2a, UNF continued to replace BSF. Right at the end of Series 2a production, wheel studs went metric.
Series 3 continued to replace BSF with UNF, and started very slowly started to replace UNF with metric for new parts - the five bearing engine was entirely metric. But the last Series 3 still had some BSF!
And many parts are interchangeable all the way from Series 1 to Series 3, and your 2a would be exceptional if it does not have quite a few assemblies that are from older or newer models.
So check what threads and spanners you actually have when working on any part.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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