is this right?

HD DVD DRIVE LASER LENS PHR 803T for XBOX360 XBOX 360 | eBay


is this what i need to start a project or is that just a lens without diodes?

It actually is what you need, despite the very confusing "description" of the product which is constantly stating "lens".

This is actually a full optical pickup sled, with diode you want in it. Pretty cheap too.

Here's one slightly cheaper

120mW 405nm laser diode sled/from PHR-803T | eBay