I found some pricing information at CTB imports website www.cbtimports.com see belowProduct Descriptions (Driving Beam) Part Number Price
Complete Super White Driving Lamp
Kit 5164 $246.91

Single Lamp No. 5104 $123.39

Replacement Bulb 15455 $24.95

Replacement Lens/Reflector 35104 $49.82

Pre-Assembled Wire Harness 34101 $45.24

Replacement Relay 33101 $23.40

Lens Cover 5100 $9.35
Candle Power 51,000

Product Descriptions (Ion Fog)
Complete Ion Crystal Fog Lamp
Kit 5161 $257.21

Single Lamp No. 5101 $128.93

Replacement Bulb 13455 $24.49

Replacement Lens/Reflector 35101 $61.67

Pre-Assembled Wire Harness 34101 $45.24

Replacement Relay 33101 $23.40

Lens Cover 45100 $9.35 ea.

Candle Power 24,000

usa/canada call 1-800-782-4686

Product Highlights Details
PIAA's 510 Series lamps feature a compact size 4" stamped steel housing with a black finish that exceeds SAE durability and corrosion standards.
These lights perform much like their bigger 6" siblings in a smaller and more compact housing. Perfect for tight locations or when size and style allow mounting of a smaller lamp.

While only drawing 55 watts each, these lamps are also an excellent choice for vehicles with alternators not capable of handling higher wattage lamps. PIAA's XTRA technology allows a better, brighter light source which can be had on a vehicle with limited alternator capacities.

These work great on bikes like the older air cooled BMW motorcycles just for that reason.

Will mount to the cylinder protector bars with a simple clam shell bracket available from your BMW dealer.
5161 Ion Fog Lamps
High performance XTRA Quartz Halogen Bulb provides an amazing 85 watts of apparent light from just 55 watts of power allowing a cooler operation and increased bulb life.

Fog/Foul Weather lamps penetrate rain, fog, dust, and snow without bouncing back into the drivers eyes or offending oncoming traffic.

5164 Super White Driving Beam Lamps

Dichroic reflection allows integral bulb to run cooler than lamps with similar wattage.

High output 55 watt XTRA Super White Halogen Bulb performs like an 85 watt bulb, yet produces less heat for longer life.

With the addition of Super White technology, the lamps approach the brightness and intensity of H.I.D (High Intensity Discharge) Headlights which are now found on many European Luxury cars at a fraction of the cost.

Kits come complete with 2 lights, wire harness, relay and switch.