Ebay timing chain kit

[LittleM@n]

Hi,

I am rebuilding a 1NZ-FE engine, fitted on a EU Yaris TS, and I have some issues regarding the. Sprockets from the timing chain kit that I bought. More exactly, the sprockets are somehow a bit smaller, and the interior fitting guides are a bit larger, so the sprokets are not fixed, as the originals are. Is this a normal issue in this kind of kits?
I don't know what to do exactly, as I quite struggled to buy a timing kit that had all the 3 sprockets included to observe now that they're not good. My mechanic says that he would use the old sprokets, even if they're a little bit worn, they're better than the new ones...
Has anyone had this kind of issue before?

Thank you!