All, I have an OE BMW E46 rack that is in great shape, but doesn’t have locks as they are no longer manufactured at this point. The same goes for the bars as well. Anyway, I have stainless Allen key hardware that I put together that keeps the rack in place and won’t corrode. if you wish to make it more secure, you could look into putting the rack on with stainless Torx bolts as well.
I would like $150.00, but will consider offers. PM me or email at roadbiker_2@att.net