Measurements of the stock oil breather are as follows:

• Outer thread diameter = 39.50mm
• Thread depth = 11mm
• Inner breather diameter = 26.00mm
• Tubing connector OD = 21.50mm
• Tubing connector depth = 17.50mm
• Wrench size to remove = 36mm
• Minimum depth of socket to remove = 24.30mm
• There is an aluminum washer at the bottom of it