Rob,
I think it was from 'Diamonds' (No3, 6 weeks on the charts) onwards that they (Jet in particular) made it to top ten status out here - 'Man With the Golden Arm', 'Besame Mucho' had been previously released but I don't think they made any real impact other than to Shads fans who knew of him - 'Scarlett O'Hara' made the top 10 charts as did 'Applejack', however I think the release of 'Big Bad Bass' (Jet) and "Song of Mexico' (Tony) co-incided with the 'demise of the instrumentals' at that time, and although they did make the charts only stayed around for a couple of weeks. Jet was well known as a member of 'The Shadows' out here, however I'd say that Jet as an individual only come to the fore with the movie 'Just for Fun', with 'Man from Nowhere' being a well respected offering that caught our attention (an excellent clip IMHO) but I don't believe was ever released on disc out here as a single, it was on the soundtrack LP from the movie though (which I still have a copy of) -of course also at that time Jet and Tony had teamed up and had 'Diamonds' 'running amok' in the charts so that may be an explanation.
All in all, Jet was, and continues to be, one of the great guitar legends of his era in Australia IMHO. RIP Jet.
Regards