Spl tie rod ends & tein inners???

I'm still waiting on confirmation that SPL have now recieved their most recent batch of SPL V5 tie rod ends, however.......

could somebody clarify something for me?

SPL offer two types of 'inner'

a) OEM inner

and

b) TEIN Z33 inner

We offer 2 types of inner tie rods for use with our outer tie rod ends, please select the correct one for your application:

For drift use: Tein Z33 inner tie rods. These beefy tie rods are supplied with steering angle spacers for increased steering angle at full lock.

For grip or street use: OEM Z32 inner tie rods. These tie rods are OEM replacement and supplied with locking plates for a OEM install.

Note: These inner tie rods work with our SPL outer tie rod ends only.

http://splparts.com/store/product-info.php?pid118.html

I've heard a few people comment that the TEIN parts are in fact OEM parts with a larger spacer?

I have a new set of OEM inners on another Z32 that I could swap over, however my Z is obviously going to take some abuse on track, are the OEM up to much or would the TEIN option be more suitable?