Double kickstand doesn't reach the ground - Ursus Jumbo

Hi everyone! I just finished my new old 90s mtb and I decided to put a double kickstand, a brand new Ursus Jumbo, but there's about 1cm-ish between the kickstand's feet and the ground, so the bike is not fully sitting on the kickstand and wobbles a bit sideways. Rear wheel is not only not lifting, but fully touching the ground and I can roll the bike forward easily. How should I gain this 1-2cm of height? I'm assuming I have to place a spacer between the frame and the kickstand's body itself? Thank you guys!

Hi everyone! I just finished my new old 90s mtb and I decided to put a double kickstand, a brand new Ursus Jumbo, but there's about 1cm-ish between the kickstand's feet and the ground, so the bike is not fully sitting on the kickstand and wobbles a bit sideways. Rear wheel is not only not lifting, but fully touching the ground and I can roll the bike forward easily. How should I gain this 1-2cm of height? I'm assuming I have to place a spacer between the frame and the kickstand's body itself? Thank you guys!