Hi guys, I am planning on trading in my piece of crap rack for an Anvil. It's pretty old, but it's extremely solid, I don't think the age has weakened it except for small scratches on the metal. Anyways, on the rear cover panel, there are holes for cables to go through, I am guessing. Are these hole on ALL Anvils, or was it someone just putting those holes there themselves as a mod? Thanks in advance.