Porterbuilt c4 front drop member/shockwave bolt?

[CYLFD]

I have a 67 Chevy w/ Porterbuilt front c4 drop member with shockwaves I'm trying to figure out what the top shock bolt is or what I should use. The shock wave calls for a bigger bolt then the hole in the drop member bolt. I don't have any of the mounting hardware for the shock.

I know I can probably call porter built tomorrow but I thought I'd throw it out there today and I might be able to get them mounted up. Thanks in advance for any help.
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