I just picked up a new set of Crane rockers for a sbc. These are called Radi-Arc. They give you the option of running them at 1.6 ratio, or 1.7. The problem is, I got them at a swap meet, and they are missing 1 pushrod seat. I called Crane, and they were discontinued 8 yrs. ago. No wonder they were so ceap. Does anyone know where I can get this part? Thanks.