[Mk2] [Turbo] NA / Turbo Engine mount differences - NA stiffer?

[Danbob]

Something I've noticed while picking out the best mounts from my collection.

One of them has a much less voided bush, and appears to have a slice of polyurethane through it.

At first I thought this might be a TRD mount, but Ebay has the same bushes listed as NA.

Think I'm going to use it, seems considerably stiffer than the Turbo mount.

Anybody else noticed this?

Ebay NA
http://www.ebay.co.uk/itm/Toyota-Mr2-En ... SwDJhXMYvv


Ebay Turbo
http://www.ebay.co.uk/itm/TOYOTA-MR2-TU ... SwSWJXRbqw


My mystery mount: