Looking for parts in Lego Digital Designer

[lome81]

hello

I can not find the following:

Id 2898 design and

Design Id 57999

thank you to tell me how pui I do?

[domboy]

I'm not 100% sure if I understand what you're saying, but those numbers do have a match if you switch to LDD Extended mode:

Click View (menu) -> New themes -> LDD Extended

Paintball gun and train wheel??