Just called H&R Springs and they told me that 10mm is not listed for a reason meaning it's not a typo. Also 15mm can't be used on the front axel because of that Note #4 which I mentioned above. I don't want to machine axle cap. All this leaves me with only a few options which is 3mm, 5mm, 15mm (only rear axle) and then 20mm, 25mm and 30mm. I think I may waste $200 on 2 pairs of spacers (like 5mm and 20mm) just to find out they can't make me happy enough. On top of that I'll have to buy longer studs for rear wheels. So it's more complicated than I thought...