My mistake . My post should have said 57 Mainline . I have a 56 Mainline  right  now .I checked on the engine # . AVQ 1619 was correct . All our Aussie Mainline "Utes "  from 1955 to 1959 were mounted on  a Sunliner  chassis . They were drilled for LHD & RHD steering boxes . Regards Lon.

PS . Bill ,I may have some info on engine # out of Canada .I will keep you in mind next time I go looking .

yblocksdownunder