Eibach spacers do not fit over wheel hub lids

Hello in the round, at my Hausser T5 were original and registered 15mm track width per side mounted on the HA. Obviously the then “self-turned” were. Because of material fatigue I have bought new ones. Eibach with 10mm per side. The inside dimension 65mm fits actually, but the disc cannot be pressed completely over the fat cap of the wheel hub. The inside dimension of the disc becomes smaller stair-shaped. If I take off the fat cap, I can easily remove the disc. But it doesn’t make any sense to drive around without hub cover. How did you solve this issue? Turning off the stairs on the inside of the disc doesn’t work either. And please don’t get any excitement about something meaningless as track spreads. The car was on the Essen Motorshow in 1996 and should stay that way. I’m looking forward to every tip. Greetings, Ulf