I'd drill and tap them for a 1/4" pipe plug, but since your motor is together... I would just measure the one you got, get a new one the same size. When you put it in be sure to stake them in there with a punch. You might even put some sticky goo of some sort on 'em so as they don't walk off again.
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Andy,Phx AZ
'67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...)
"23 C-Cab-sold
'48 Ford 8N tractor(still working)
'67 Scout(Now on the road)
'70 MG B.-sold
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