25 or 30 is fine, grab whatever you find, I had originally used female hex bolts, but later replaced them with pan head conventional hex bolts... they're just regular bolts with a broad washer like surface to distribute pressure. Got them in stainless for around $5 at a local Ace hardware store.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.
If you're so inclined I'm always more than happy to accept tips via PayPal. 
Tip Jar ---> 
|