Go to Mustangs Plus. They have 'em too. Same price.

 

Mustangs Plus sells Opentracker's roller perches, but right now his site apparently has them on sale for $25 cheaper.
I talk with John the owner quite a bit, really nice guy and very down to earth.

 

I've got a set that I'll be putting on the 65 Mustang and they were on sale. John knows Mustangs and he races what he builds.
Here is a link for another Mustang nut that shows you how to make your own roller perches: http://home.bresnan.net/%7Edazed/DazeCars

 

I would rather buy them from him anyways, seeing as how he makes them and runs them on his own cars...

 

I say go with opentraker he didn't charge me shipping to the netherlands on mine!!! Very nice bloke, I have seen them in cj ponypart but for more cash, plus i like some of the other stuff he has but would need more cash!!!

Paddy