No problem!
There are no dimensions on this drawing, but to enable you to scale from it, the centre distance between the two gears is the same as that between the crankshaft and the large keyhole-like hole in the front of your Meteor crankcase.
I would suggest you use it in conjunction with some pics from Google so you can get a better idea of what it actually looks like.

Note, to get the full-size images, click on the picture, then click on the new version and it will open in a new window at full size.

Pete