Well....... I rang up the Toyota office at Acacia Ridge and spoke to the tech guys there. No one there has heard of an L50 gearbox. The closest they could come up with was a G52 . I went to the wreckers and checked a few out but the linkage setup is completely different to my L40 (thats if my box really is an L40.. I'm just going by what it says on the manufacturer's plate).
Looks like I'm stuck with the W50 box. I mounted it (No, not like that! ) into the ute this arvo and everything fits perfectly EXCEPT that the shift is definitely too far back and will foul the seat in all but the rearmost seat position.
Gianttomato, you wrote that you know of at least two positions (I guess that would be the missionary and the ...er...?), would you know of anyone I could contact that could give me the inside info on how to alter my box to move the shifter forward?