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McMaster is expensive ! Your local steel yard has all this.
The bolts If you measure the socket in the jacking point ,you'll realize a bolt head is a tedious shape to use.
I made some using flange head nuts and a bolt -upside down to what you propose. The leading threads of the protruding bolt shank act as a primary guide into the lift point socket Then 1/4" behind comes the nut.The nut almost fills the socket width. The flange shoulders actually rest on the face of the jacking point. A structural steel H.D. washer may help. Be careful it is not the tip of the bolt that supports the car ! You want the weight on the flange & /or the structural steel H.D. washer
Bolt Depot !
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