Welcome to the best choice of BMW 5 Series alloys.
Do you need BMW 5 series alloys to fit your new motor?
This website has a range of 5 series alloy wheels for your vehicle. These BMW 5 series alloys come in various sizes and most of the models should be able to fit 18" alloys underneath the arches without any modifications. The stud fitments for the E34 and E39 models should be the same. The BMW E60 and E61 have different stud fitments as well. If you own a E12 or E28 again you will have get different alloy wheels fitments for these.
Some of the wheels also had metric style wheels on them, which meant the tyres were a special size and of course a lot more expensive. People decided to fit aftermarket alloys which meant normal tyres could then be fitted and saving money. Depending on your specification of your BMW 5 series would depend on which size alloys were fitted to your particular model.