Rally gearbox

Im looking for either: a 5 speed dogbox or 5 speed straight cut... so my question is what manafactuers do them so far i ve got Harry Hockley, Elite and Hewland.

Also has anyone ever converted a K11 1300 to take a vauxhall gearbox ie F10, F13 or F15??

Any info muchly appreciated?
 
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