try the Original "VM-1S" Sling Plate with the Extended Nylon strap and Metal D-Ring..
I used to sell them on ebay/gunbroker under ranbo1213.
All other models u see "are copies" of Vince Ortiz's invention from Meanstreet Performance Fabrication, out of San Mateo, CA, phone number 415-271-4839. Slightly higher in price, but well worth the extra cost (u get what u pay for!)
some fine tuning may be requried for it to fit the S-12 Conversions, but for all other AK's, it screws right on under the pistol grip and its of excellant quality. there are 2 models, the VM-1 for Draco's, and VM