Rear brake light bulb??

[mig1980]

Good day everyone. I finished installing a JL 10" sub stealthbox and amp this weekend and it sounds awesome. This morning I noticed that y rear brake light was not working. It actually mentioned that the brake light was not working as soon as I put everything back together. It is not the entire brake light, just the bottom portion along with the blinker (rear only). I was wondering if you guys had any idea as to what type of bulb I need? I have a spare buld from the same spot of my 328ci but haven't pulled out the X5 bulb given that I will have to pull out the sub box as well and don't know if this bulb would fit.

Any input would help.

Thanks.