Wheels from Alpina B10 on Land Rover Defender: compatible?

No, the centre bore is too small

Same 5x120 PCD, but the centre bore of the wheels from Alpina B10 (74.1 mm) is smaller than the hub of Land Rover Defender (114.3 mm): they will not fit without being re-bored by a professional.

Alpina B101988–1996Land Rover Defender1983–1990
PCD5x1205x165.1 / 5x120
Centre bore74.1 mm114.3 mm
ThreadM12x1.50Ecrous - 16x1.50
Original wheels ≈7.5Jx17 ET12
≈7.5Jx18 ET20
R
≈7.5Jx16 ET33
≈8Jx18 ET42

≈: width estimated from the original tyre size.

Before fitting the wheels

An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Land Rover Defender (Ecrous - 16x1.50), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.

And the other way round: wheels from Land Rover Defender on Alpina B10?