Huge thanks to Mr. Tagliavini from Supertech! My local dealers didnt have the rare shims in stock, so I turned to Supertech itself. After explaining the situation, Mr. Tagliavini sent me the ones without a charge!
The missing shims was purely my mistake, so this was very generous from Supertech!
And, after measuring the gaps once more, the camshaft was ready to be installed. 🙂