Durus 68X8 CAP4 - 68mm × 8mm Metric End Cap 3.5/16" The CC330 is used for

The CC330 is used for serpentine drives with multiple driven pulleys

"name":"3VX1060 V-Belt 3/8 x 106in Outside Circumference"

so the Megadyne 12/B225 interchanges with Gates

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"name":"Gates T5-640-16 Synchro-Power Polyurethane Belts"

Durus 68X8 CAP4 - 68mm × 8mm Metric End Cap 3.5/16" The CC330 is used forThe Durus 68X8 CAP4 is a metric end cap (68mm bore 8mm depth) with a nitrile rubber coating that improves OD sealing in a variety of housing materials. Used to plug or close a bore where no shaft penetrates in gearbox covers, bearing housings, and similar static sealing applications. Specifications Part Number 68X8 CAP4 Brand Durus Category Metric End Cap Seal Type CAP4 Metric End Cap Type 4 Inner Diameter (Shaft) 68mm Width 8mm Material NBR (Buna N)