Update
Updating database... Please wait.
Tuesday 19 December 2017 at 22:22
Leg bolts tend to be 5/8 2-3/4. These can't be found at a hardware store. http://www.pinballlife.com/index.php?p=product&id=1792
Head bolts tend to be 9/16 but the lengths vary. Also use a big washer with it as the bolt head can get pulled into the hole. These can be found at a hardware store.
...
Source: http://pinside.com/pinball/forum/topic/surf-champ-parts-question#post-4131817