This is what I have in my notes:
B2 Piston Seal and parts
B2 piston number 170 270 04 32 (1702700432) {number cast into the piston 126 277 11 38}
{Outer O-ring 005 997 70 48} for the Cover
{plastic bushing 126 277 08 50}
{Lip Seal verified 006 997 73 47}
Use the part numbers to shop with.

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84 300D, 82 Volvo 244Gl Diesel