Nigel, I don't want to be pedantic, but as I recognise your figures, maybe it should be noted that the 454 RHD were what was imported into the UK, it makes no allowance for other RHD markets such as Japan, HK, Australia, NZ, Malasia etc, so the LHD figure is likely to be less.
Thats a good point, the 454 is UK RHD cars only. If you go onto the ferrari owners website www.owners.ferrari.com and email them, they will tell you. They were very helpful when I asked them about RHD F50's.