OK Jackson 5 everybody wants to see your photos of the housing you made. Here's my answer to Labs question above about the breather fitting 850 MK3s with the original prestolite starter. I just started making angled threaded fittings for the Mk3s with original starter to replace the original tube breather - plenty of room now. See one way reed valve breather below (with BMW stainless reed). The same basic breather fits all other versions of Commando (& Atlas) but in different locations. Photo supplied by customer (thanks Mark).