Ariel OG/OH Burman H Gearbox

[GuyH]

Just renewing my regular call for a 4 speed Burman 'H' or 'HP' gearbox. It's the oval/triangular shaped one and as far as I'm aware only fitted to the 1939 250s in the Ariel range and also the pre-war AJS model 12 250s and reputedly some pre-war Red Panthers. These were often plundered for fitting into trials machines so may not be on an Ariel these days. I'm also looking for an outer and inner chaincase for the same bike. I've uploaded a couple of photo's of each. Also, does anyone know of a good and reasonably priced foundry which can cast a couple of chaincases for me? All help and information gratefully received!