Thanks BB
Yes there certainly is a shortage. I got these two from up near Sydney.
I had done quite a lot of reading on the forums over the last few days and I was pretty sure that the twin railer was cracked that's why I included a photo of the rails. The clutch hub has also go a crack in it and will need to be replaced as well so I'm thinking the best thing for me to do now is try to get the solid deck going and use it for now and rebuild the twin rail machine.