There is an image of an Indian swinging arm in Hitchcocks used spares,
http://accessories.hitchcocksmotorcycle ... sion/26354 if you compare it with the below images you can see that the designs are quite different, however all the important dimensions are the same.
The Continental GT swinging arm and the Indian swinging arm use the same metalastic type bushes at the pivot. The cutout for the axle is the same distance from the pivot at 14.5 inches.
The shockabsorber mount is approximately 2 inches further back on the Bullet swinging arm, and the design makes it difficult to mount the shockabsorber further forward. Despite this I would suggest that it is still the best option if you intend using an Indian hub as well.
I have measured the distance between the shockabsorber mounts at 215mm which I THINK (so check) is 6mm narrower on each side than the Indian ones. If you look at Indian Bullet frames you will see that the top shockabsorber mounts are off-set 6mm from the centre of the frame tube unlike the English frames.
The part I describe as a frame insert is described as SWINGING ARM THRUST WASHER Code: 46265 in the parts book. This converts the frame from the earlier type swinging arm to the later metalastic bush type. (The Indian frames do not have these sacrificial inserts)
These need to be welded to the frame as there isn't enough room to fit the huge nuts that normally keep them in place. If you weld them on the inside of the frame only, you will be able to grind the welds away if they should ever need replacing.