Click to expand Tap to zoom HTD S6 Silicon O-Ring (10) by Mugen Save $-8.00 $8.00 | / SKU E2242 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart This is a pack of ten replacement Mugen HTD S6 Silicon O-Rings for use with the HTD (High Traction Diff) Differentials.