Thinkin' Inside The Box

Got most of the gearbox back together yesterday, still need a few new screws and odds 'n' sods to button it up. Never the less it's shifting through the ratios like a shiftin' fool so it's all good. Strange thing is, that there's long sleeve nuts on the four through studs holding the outer covers on. The couple that are still there are a bit battered but when I try to get hold of a new set nobody knows what I'm going on about, They all reckon they should be long reduced hexagon nuts, but definitely not sleeve nuts. Mind you there is a gearbox listed for 1948 - 50 only, could be that.

Fear not, the blue Hylomar will be gone when it all ready to rock an' roll.