Well putting valve springs in dropped a collet/keeper. Stepped off the edge of a stool while transferring from pencil magnet to hand. I heard lots of tinging and think it fell off passenger side of engine. Should have stuffed pushrods holes for safety but looking back is 20/20. I'm 98% sure I dropped down left side but ran magnet down pushrod holes for piece of mind. So next question what's the part number and where to get these things? Is 12v the same? I'd imagine not with valve size. Well thanks in advance