Dan,Most of the 5 speed boxes in the Renault range will fit,The JB5 is the one to go for or if you can get a good one a JC5 (I think) is the Williams.However I,have used a JB3 5 speed box from a 5Turbo,the down side is that,this has the electrical speedo.If you are not bothered I use them for my rallying and use a Stacks dash,so it does not bother me.Have a word with Bayliss on here,as he has having one refurbished for his valver.