The stock wire holders that push down on top of the valve cover bolts are too narrow for my new wires, and some came broken when I got the engine anyways. Anyone know where I can get some new larger diameter ones to hold my new Accel spark plug wires in place?

 

You might try NAPA or Advance Auto Parts. They have a help section that has all sorts of clips, screws, hangers, window cranks etc. The might have a wire loom that would fit the larger wires.

 

I found some at Summit and JCWhitney, but I had to search for keywords since they weren't coming up for me under electrical or spark plug wires. Ran $50 or so for billet aluminum, wires size ranging from 7mm to 9mm.