Hi Ian
I have a lot of spares for the E 29 600 c.c Douglas which may be identical to the E 28, including a crankshaft and a spare engine. The priced list is attached, post and packing extra. Hope this is of interest and can get you on the road. I have two Dougies - 1932 A 32 and a 1951 Mk. 5.
Regards
Paul