No drilling as there the right stud pattern, yes. Yes you need hubcentric spacers as universal one are generally dangerous at that width. At the least they will cause wheel wobble at high speeds.
If your running 20mm hubcentric spacers you will need longer wheel bolts. Ideally u can buy better quality hubcentric spacers. Where they have 8 holes instead of 4, the spacers/adaptors bolt to the hub then the wheel to that.
Read over what I wrote before. The centre bore (the hole in between the bolt holes) of a
Saxo is something like 65.5mm & fords 59.3mm so the bore needs machining wider. Or alternatively u can buy 20mm ford to cit adaptors that have the smaller bore negating the need to enlarge the bore. The last option is what I do when using ford wheels