What you will get is a original bare lamp WITHOUT housing for OPTOMA HD33.

The Original bulb is OSRAM P-VIP 230/0.8 E20.8, your old version may have black letter on it, but new version is like my above pictures

This bulb size is round 51mm, Many OPTOMA projector use it. 

Your old housing can repeated used, if your housing glass or wire broken, you can buy the glass or wire alone from me.