R Series Torsion Bars

Hey Fella's, got a question about torsion bars for an R series in particular. Out Here in Australia Our R series has unique torsion bars...(they have a half twist)....from S series on All torsion bars are the same...flat to flat

My Question is I need to replace the bars in My R, are They available in the US?

any help would be welcome, cheers Steve..