Fiat only ever made them in LHD, but I've got it in the back of my head that DTR Sportscars did a RHD conversion. Not sure how many they would have done or how good it was, though.
FWIW, I've had two LHD cars and it's really not a problem after the first few days.
DTM do do RHD conversions but even they recon that its not worth doing. I have one, I bought it as a temporary fun car and I still have it 2.5 years later, it is a fun car to drive and own, has been very reliable and I don't find the LHD a problem most of the time.