4301B wall brackets

[Crotalus]

Hoping to get some information on whether the brackets attached to the 4301B's I picked up at the thrift store are something JBL offered or aftermarket/hardware store. Also if anyone has seen these before what the other part of the bracket would look like? Thanks!

http://img707.imageshack.us/img707/5849/p1030892c.jpg
http://img52.imageshack.us/img52/7101/p1030927n.jpg

[Rusnzha]

Looks like hardware store vintage stuff. Ain't from JBL.

[Audiobeer]

Definetly Aftermarket.

[BMWCCA]

Common eye-bolt:

51755

[rdgrimes]

At least he used washers.

[Crotalus]

Thanks guys, that is what I figured, just wanted to be sure.