Flat replacement belts fit most power nozzles including:

All Compact Tri Star (Little Pig) Eureka that use a flat stretch belt (some Tri Star vacuums take a cogged or geared belt)

Panasonic UB4, 

Rainbow, Sears Kenmore, Beam 48201 & 155301. 

If you're not sure call me toll free with your model number at 877-656-4861 and I'll make sure you get right belts. 

Keep your Power Nozzle and brush roll agitator working like new all the time. All vacuum belts should be replaced at least every six months. Compare a belt that has been installed on your vacuum for 6 months (even if you haven't even turned the vacuum on) with a new one and you'll see for yourself how much bigger around it is and you'll understand why it's not picking up dirt like it used to. Belts stretch and lose elasticity and will cause the brush-roll to slip as the vacuum is agitating your carpets rather than spinning at the full speed required to deep clean your carpets. 

WARNING: Failure to change your vacuum cleaners belt at least once a year will takes years off the life of your carpets and flooring. A litle rubber band is the cheapest and the most important part on your vacuum cleaner. It must be tight enough to make the brush roll spin fast enough when its forced into the carpets fibers to agitate and loosed the heavy soils so the vacuum can suck them out of the carpets.

WHY do vacuum belts NEED Changed if they're not broken?
It's hard to get a new vacuum belt on because it is much shorter than the old belt. Every day your belt looses elacsticity (think of a 2 inch rubber band that you stretch to 4 inches and leave it that way for a few months) Even if your vacuum has never been turned on the belt is stretching and loosing elasticity as you read this. Each day it doesn't work quite as well as the day before. It may still pick up hair and  dust but can't agitate the heavy sandy, gritty soils to the surface of the carpet fibers to be vacuumed out. After 6 months the brush-roll really starts to slow down. It may even stop spinning completely when it contacts the carpet. 

Slipping belts and/or brush-roll agitator may cause the following: 

1. 1.     pre-mature wear of the agitator
2. 2.      poor sweeping results. 
3. 3.     Shortened belt life and performance

Many popular parts are available as replacement parts meaning they are not sold under the name tag of the original manufacturer. This does not mean the replacement part is not good, sometimes it is better than the genuine parts. It just means it doesn't carry the original manufacturers name tag. It may be made by the same company that made the "genuine" parts. Some parts sold as "genuine" are actually bootleg or knockoffs. It is buyer beware to insure you are purchasing from someone you trust will supply you with quality genuine and aftermarket products. Just like when purchasing "store brand" or generic items at the store, some items are better than the genuine and some are not.