Chassis rivet size?

[Howard Wright]

Hi All

I'm going to be riveting the various parts of the chassis together in the not too distant future.  I can't seem to find anywhere that will tell me what size rivets to use.

I guess most rivets are 1/4" although the brake cross shaft holes seem smaller.  How long do the rivets need to be before being hot hammered down.

Thanks in advance

Howard