I put the flat side up and radius side down so it fits nicer in the groove. Either way. I'm now scared of the wire retainer costing me another set of custom magnum pushrods since they take 3 weeks to get in.

Since they look like all the other snap ring hydraulic lifters. I'll take the chance. Its still far superior then the wire retainers.

I will update with results. If these fail then I ll be forced to get diff lifters and or go mechanical with adjustable rockers.