Does anyone know the size of the black push in pins thst hold the windshield washer bottle and the radiator overflow are? I need to replace mine

i went through this a little bit ago, 1/4 is too small. 5/16 fits perfect so i got some 5/16 nuts and bolts since i couldnt find 5/16 push pins. i know ecklers has reproduction washer push pins but theyre like $3 each plus shipping no thanks

Solaris is right, 5/16 is perfect, but good luck finding pushpins that work. I'm using bolts/washer/nuts temporarily (they look good though) until I make a purchase through Ecklers that justifies the shipping expense.