Garage door opener installation hardware pack, that was labeled as the blue bag in the original instructions for installations. This was included with Screw Drive models (listed below). 

• Compatible with models: 2564, 2568, 3064, 4064, 2562, 3062, 4062
• Installation Parts Pack includes: (2) Hex Nuts 3/8-16, (2) Cotter Pins 0725 DIA, (2) Hex Screws 3/8 X .87, (1) Coupler, (6) Screws 1/4-14 X 5/8, (2) Clevis Pins 374 X 1-7/16