But every parts store or scrap yards in USA will have hundreds of every part for AA5's. Also the the other issue about range -- same tanks in the Cheetah or Tiger but, yes the 180hp does use more fuel, but again so what --- they will both do over 3 hours and that is about my maximum range before wanting the loo or a drink.
If I remember correctly not all Cheetahs come with the same size tanks. The AA-5A had a smaller tank as standard and a larger long range option which was the same size as the AA-5B Tiger.