SPAC became "Clubs" (plural) after the demise of the Lae and Rabaul flying groups/clubs and the amalgamation of Port Morbid, Lae and Rabaul clubs. I remember the amalgamation, but it's all in Jim Sinclair's book, Balus III.
Talking of SPAC, how's my old mate RT, the Prime Minister of Albania? Still playing around with Aerostars?