You ever get your sensor lights fixed ?

I googled "drive pulley size"  and got some interesting links, any of these helpful?

http://power-transmission.globalspec.com/LearnMore/Mechanical_Components/Power_Transmission_Mechanical/V_Belt_Pulleys

V-belt pulleys or sheaves mate with drive belts in numerous power transmission applications. V-belts are efficient, cost-effective, and designed for non-critical ratio drives. They usually have a triangular or trapezoidal cross-section and are reinforced with fiberglass, polyester, or steel. V-belt pulleys are made from materials such as aluminum, brass, cast iron, steel, stainless steel, plastic, or zinc alloy. Both single groove and multiple groove devices are commonly available. There are several basic types of products. Standard V-belt pulleys have one or more grooves and are designed for general-purpose applications. Variable speed pulleys have faces or flanges that adjust axially to vary pitch diameter. Idler pulleys are used as belt tensioners and contain bearings that allow free rotation. Companion pulleys have ribbed webs for high strength-to-weight ratios. Multiple-size pulleys use step-down or cone configurations. Poly-V pulleys are used with mating belts for high-speed power transmission. Typically, both the section designation (H, J, L, M, or PK) and the number of ribs requires specification and belt-pulley matching.  

Belt size is an important consideration when selecting V-belt pulleys. Both English and metric belts are available. English belts have numbered or letter designations and are measured in fractions of an inch (in). Belts with sizes such as 1/8 in., 3/16 in., and 1/4 in. indicate the width of the belt at the top. Belt types O, 3L, and Z are 3/8 in. or 0.44 in. wide. Other English belts include A and 4L (1/2 in. x 5/16 in.), B and 5L (21/32 in. x 13/32” in.), C (7/8 in. x 17/32 in.), D (1-1/4 in. x  3/4 in.), and E (1-1/2 in. x 29/32 in.). English belts with sizes such as 3V (3/8 in. x 5/16 in.), 4V (1/2 in. x 13/32 in.), 5V (5/8 in. x 17/32 in.) and 8V (1 in. x 29/32 in.) are also available. Metric size belts have numbered or lettered designations and are measured in millimeters (mm). Lettered metric belts include SPA (13 mm x 8 mm), SPB (17 mm x 11 mm), SPC (22 mm x 18 mm), SPZ (10 mm x 6 mm). Metric belts with a width of 5, 6, 8, 10, 13, 17, 20, 22, 25, or 32 mm are also available.


http://energyconcepts.tripod.com/energyconcepts/vbelts.htm

If you are talking about a car, check out Autozone.com

Quoted: Quoted: You ever get your sensor lights fixed ? Yes I did and you were right, it was the bulb. (For the HPS) Thanks for your help! ETA, I also change the incandescent lamp to a 130v and so far so good.

Was wondering since you never bothered to reply to the IM.

I could probably hook you up with something in a 3 inch wide, 8mm Gilmore belt
With a 8-71 blower, and a 502 Chevy to run that thing

Quoted: Quoted: Was wondering since you never bothered to reply to the IM. Sorry I thought I saved it and after I changed the them the next day I remembered to reply but it, got swept out with the trash. Tell you what, I'll make or buy you a Manhatten in time.  Thank you again!

That's cool.....  Glad it worked out.  You're not the first to not write back, aint the end of the world. I just like knowing if something I suggested actually fixed someone's problem.  It's nice to be able to help out a little here when I can, and I'm always curious to know what it ended up being.  

I figure it's the least I can do, after everything the folks here did for me


John

Quoted: Quoted: I figure it's the least I can do, after everything the folks here did for me John See sigline.

HA !    Now that's funny.