booster to master cylinder pushrod?

[cruizin01]

I'm about ready to put the booster back on my 78 and it seems to be missing the pushrod for the mc. I can't really find anything online about just replacing the pushrod. The few pictures Ive found just look like it has an oring on the end.

http://img246.imagevenue.com/img.php..._122_159lo.JPG

The only things Ive found is from Classic Industries but its seems to be for earlier trucks.

https://www.classicindustries.com/pr...rts/pbk10.html

Anyone have any experience?
I'm using a corvette master for the rear disc but I don't think that matters.

Thanks

Derek