The standard AL-KO hubs will not except D3/D4/RRS alloy rims, because the D4 alloy rim is tapered and will not sit flat on the hub, I know this because I and others here have tried, I had to buy steel rims to fit to our camper, I now have 3 D3 rims sitting in the shed as extra spares now for when I damage a rim offroad.
The only alloys you can fit to AL-KO hubs that fit the D4 as well are BMW X5 in 17" as far as I know.
If you really want an extra spare for the car, get steels rims in 5 x 120 and fit tyres so that the rolling diameter is the same as your D4 19s, then you'll be able to use them on the D4, which is what we have done.
Cheers Baz.
2011 Discovery 4 SE 2.7L Kerrys
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1979 BMW R80/7 (Scrambler project)
1983 BMW R100TIC Ex ACT Police
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