OTC 217687 Caterpillar Engine Adapter Mounting Plate - Caterpillar Engine Adapter Mounting Plate for 1750A and 1750 diesel engine stands. No. 217687 – For Caterpillar 3114, 3116, and 3176 in-line 6 cyl. and C12 engines. Mounting plate includes all the necessary hardware and an engine application chart.NOTE: No. 205061 Universal Adapter Plate Assembly is required for use with all plates (Included with 1750A engine stand).