After further research I've decided to try these, and ordered them from Amazon:
- 45" long battery cable (positive): ACDelco 4SD45X
- 35" long battery cable (I'm running headers with no air conditioning so my ground location is farther away from the battery than original): ACDelco 4SD35X
Note: If you have the original ground location with exhaust manifolds the 25" long ACDelco 4SD25X should be right.
These cables do have a nice side terminal end, but are generic black.