Wizzbit

Hello sorry in advance in new to this iv got a 535d m sport it's a late 06 I want to change the bulbs in the halo part of the light but I bought some off eBay four of them but it looks like I only need one bulb to run two halos is this right and if so can some one giv me a link for the ones I need pls thanks

Hello sorry in advance in new to this iv got a 535d m sport it's a late 06 I want to change the bulbs in the halo part of the light but I bought some off eBay four of them but it looks like I only need one bulb to run two halos is this right and if so can some one giv me a link for the ones I need pls thanks