No longer have my 66 Mustang, but i bought this clutch and mounted on my non-stock DeTomaso Pantera, but ended up being the wrong clutch/flywheel. Engine was never run. I paid $1,100 for it in 2022 and it currently sells for $1,045 on Summit before taxes. My loss is your gain. I do NOT have the plastic alignment tool, but those are pretty cheap to find. Will ship at buyer's expense.
Specs from Summit:
Manufacturer's Part Number: 430103C
Clutch Usage: Performance
Clutch Disc Quantity: 2
Flywheel Included: Yes
Input Spline Quantity: 10
Input Shaft Diameter: 1.063 in.
Disc Diameter (in.): 10.500 in.
Disc Diameter (mm): 267mm
Disc Material: Organic
Disc Style: Full face
Hub Style: Unsprung
Pressure Plate Style: Diaphragm
Throwout Bearing Included: Yes
Alignment Tool Included: No
Pilot Bushing Included: No
Flywheel Material: Billet steel
Ring Gear Tooth Quantity: 157-tooth
Flywheel Bolt Quantity: 6
Engine Balance: Internal
Counterweight Assist: No
Mounting Hardware Included: Yes
Quantity: Sold as a kit.
Notes: Street Twin double disc clutch kit for vehicles up to 1,200 horsepower with cable clutch linkages.

Wheel Automotive tire Tire Gas Rim

Wheel Automotive tire Rim Hubcap Alloy wheel

Tire Wheel Automotive tire Tread Watch