106 flange sizes

First of all, good forums. I think of the front back flange for my quicksilver tool. I couldn't decide the proportions, what are the ideal dimensions for you?

I was able to upload the vehicle photo below

https://ibb.co/hsb6mq

Good forums are usually 2 cm is enough, others are very exaggerated 2cm is the most ideal one especially at the back.

https://www.sahibinden.com/ilan/yedek-parca-aksesuar-donanim-tuning-aksesuar-tuning-otomobil-arazi-araci-tum-araclar-icin-flans-spacer-ve-bijon-192799917/detay

1.5 to them, 2.5 to backs
I was thinking 3 thanks