Durus 125X12 CAP4 - 125mm × 12mm Metric End Cap SPZ The D&D Global 17/3V1000 is

The D&D Global 17/3V1000 is a standard V-belt featuring Narrow wedge 3V dimensions

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so the Megadyne 8/5V2120 interchanges with Gates

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Durus 125X12 CAP4 - 125mm × 12mm Metric End Cap SPZ The D&D Global 17/3V1000 isThe Durus 125X12 CAP4 is a metric end cap (125mm bore 12mm 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 125X12 CAP4 Brand Durus Category Metric End Cap Seal Type CAP4 Metric End Cap Type 4 Inner Diameter (Shaft) 125mm Width 12mm Material NBR