Need some help. I got a rear rack from ebay, said it was new, but didn't come with any bolts for mounting. I'm guessing the existing bolts in the seat rail will work for that part. I did see in a previous thread that knifemaker suggested a bit longer bolt for these. No problem there, just take the existing one and get a longer version of it. What I don't know is what size to get for the part that bolts to the cross piece under the seat. If anyone knows, please share.