Hi Peter (and Alwyn),
I have just checked through the sample spokes that we hold and the details are as follows (all lengths are measured from inside of bend to end of spoke):
27113 8-3/4" x 80 degree
27114 6-1/2" x 80 degree
37944 8-3/4" x 100 degree
37945 6-1/4" x 100 degree
27022 8-3/8" x 80 degree
27023 8-3/8" x 100 degree
37946 8-1/4" x 90 degree ***
All spokes are 9g.
Regarding the offsets for the wheels:
Rear wheel - from speedo drive end of hub to centre of rim is 3" ***
Front wheel - from face of brake drum to centre of rim is 1-5/16"*** (face of brake drum lines up with side of original WM2 rim)
*** these dimensions were taken from my own wheels as we do not have any official sizes/dimensions for them.
Hopefully this will help with your restoration,
Regards,
Eddie.
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