I use the DH Labs BL-1 terminated with Cardas GRMO's made by Moon-Audio on my TU-317, if that's any help.
My 717 is in storage, so I can't pull it out, but if the RCA's are the same as on the 317, they are a little short and the GRMO's are a tight fit and hard to put on. You might want to go with an I/C with a WBT type locking RCA to make it easier to get them on and off. Analysis Plus comes to mind. I believe I tried a Silver Oval In on the 717 when I was using it, and don't remember anything bad about the combo.
My 717 is in storage, so I can't pull it out, but if the RCA's are the same as on the 317, they are a little short and the GRMO's are a tight fit and hard to put on. You might want to go with an I/C with a WBT type locking RCA to make it easier to get them on and off. Analysis Plus comes to mind. I believe I tried a Silver Oval In on the 717 when I was using it, and don't remember anything bad about the combo.