Does the E29 use a cast alloy primary chain cover or one of sheet metal? The two E/F29 models I have seen both have obviously home-made primary covers of sheet metal, and in the catalog pictures you can not tell if it is a sheet metal pressing or an aluminum casting. Unfortunately I do not have a parts list for that particular model. So I am not sure.
In the period pictures and illustrations I have seen looks the same as that fitted to the E/F28, and that was sheet metal. In fact, except for the saddle tank and a slight change to the frame to suit, the 1928 and ’29 are very similar. I have a F28, the illustrated spares list, and drawings for the sheet metal primary cover and final chain guards, and some information for the mounting clips for the same if it is of help. That is if they did not change them for 1929.
If you have the 1929 spares list you can compare against these from the 1928 list:
9674 Guard for clutch protection (wraps around front of clutch sprocket)
c/9549 Front chain guard
c/9673 Clip stud supporting guard to top of crankcase (typo, it supports the front lower edge, or else the part numbers are reversed with the following item)
c/9672 Bottom clip for front end of guard
c1/9547 Rear chain guard with support lugs
But since Darren has a 1929 and he say alloy, the prognosis is not good for a match.
-Doug