Just so theres no confusion the 'new' box that Sparky has is a late bay box and only available in LHD, the chassis still needs modifying but not as much as fitting an original Late Bay Box, we run one on the Sunroof Deluxe and in fact are on our second one, they need adjustment straight out of the box and need constant adjustment, if used a lot life expectancy of 2-3 years.
JK are now offering rebuilt boxes in LHD & RHD format, Ive asked them who is building them for them but they are refusing to tell me even though I'm a trade customer??, I suspect they are built by N2 engineering who also rebuild boxes at a similar price but once again I'm not aware that they have had new worms made.
So its clear we can supply all the parts to rebuild the steering box yourselves (except the worm due to reasons mentioned previously in the thread), we can even supply a full kit of parts with instructions so if you are good with spanners etc its a DIY job, the kit is now £149 plus delivery.