Couplers 5/6 have variants

• coupler-for-ground-rod ✓ variants
• coupler-for-ground-rod-4 ✓ variants
• couplers-press-fit-for-unthreaded-rods ✓ variants
• crimp-c-connectors ✗ no variants
• ground-rod-connectors ✓ variants
• internal-coupling-dowel ✓ variants