3842448 Boom Cylinder Seal Kit fits Caterpillar 302.7D 

• Fits Caterpillar Cylinders 
• #302.7D Boom Cylinder#3841130
• Serial#LJ71-UP;LJL1-UP
• 40mm Rod X 70mm Bore
• Includes Wiper, U Cup, Buffer and Piston Seals
• After market seal kit for Caterpillar equipment