Which Hi-Gain Pickup In Middle Position - Neck or Bridge?

[LenMinNJ]

The two Hi-Gain pickups on a 330 are not identical.

The chrome covers seem to be identical but the spacing from the centers of the two outer pole piece on the neck pickup is roughly 1-13/16". On the bridge pickup it's 1-29/32".

Which of the two is used for the middle position on a three-pickup guitar (e.g., a 340)?

[LenMinNJ]

I think that I have my answer.

From the images of 340s and 350s that I've seen, it looks like the middle pickup is a neck pickup.