The rear hub parts are prototypes - I assume this would involve both new rear arms and new hubs as production parts. This keeps the same overall width but moves the pivot inboard which is supposed to aid rear traction / stop it breaking away under power.
I've not tried it yet but hopefully soon
I did have the front end 'team mod' on my car, but after smacking into a bench at Worksop and replacing suspension arms, I didn't want to keep drilling the hole for the new pickup point. So I've reverted to standard kit suspension setup at the front and still thought it was great at Batley last weekend - very pleased with how it went.