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I suggest the 46-8 is the same .I have a 39 Merc ,they are 116 wheel base same as 46 ford . The early merc. drive shafts were one piece but the latter and 40 were 2 piece same as 46. The early Merc. housings did use the 112 39 Ford tube with a piece welded in the centre to lengen them to 116. So what you have should work.