DOP75-136 Dynamark Deck Drive Belt fits 38", 39" & 45" Cut Decks No. 30068OP. The Dynamark Deck Drive Belt is a high-quality aftermarket replacement belt designed to fit select Dynamark and Eagle Star riding lawn mowers with 38", 39", and 45" cutting decks. Measuring 5/8" x 77-1/2", this durable belt is engineered for dependable performance and proper fit, making it an excellent replacement for OEM part number 30068OP.