I had a look online at the part numbers you showed and it looks like the older AC-039 part has a white and black lock on the PCI-E connector (the part that you plug your graphics card into) and the newer AC-053 has the more modern double black finger, the same as on newer motherboards.
There is a Premium Cable 300mm AC-045-CN1OTN-C1 on the Thermaltake website. Under Chassis and then Accessories.
http://www.thermaltake.com/Chassis/Accessories_/_/C_00003013/TT_Premium_PCI_E_3_0_Extender_300mm/design.htm
I hope this helps.
katie1348 got a reaction from OleP in **ATTN Users with Thermaltake Riser Cables**