KMJ roller rockers for 360

I built a 360 with a big solid cam and need adjustable rockers... I have x heads that have been completely rebuilt and Porte and polished

My question is has anyone used these rockers on the x heads because on the eBay page they say they can't be used on J or X heads.... And from my knowledge all small block heads are the same please I need help

These are the rockers

http://www.kmjent.com/cart/product.php?productid=444&cat=20164890&page=1