I'm not certain which alternator you have.
Here's a link to Delco alternator upgrade/rebuild kits. This site also carry parts for other brand alternators such as Denso, but no longer carry the Denso upgrade kits, which upgraded the larger case Denso to 200 amps.
Components:
- Precision wound, double insulated stator
- Transpo heavy duty rectifier
- Transpo heavy duty voltage regulator
- Premium quality brush assembly
- Heavy duty 1.5Mfd Capacitor
- Heavy duty diode trio
- Premium, double sealed, hi-temperature WBD bearings
http://www.aspwholesale.com/alternator-upgrade-kits/delco.html
Careful when looking at alternators on eBay, many of eBay upgraded and high output alternators basically use cheap parts and may only rewind an alternator to try to acheive higher output. A quality high output alternator does much more than rewind, it upgrades the stator, rectifier, voltage regulator if applicable and possibly other parts with quality built parts. A good high output alternator is able to achieve a better at idle output and not only a better WOT or higher rpm rating.
Manufactures that actually build High Output alternators their cost can become high because most people stay with an OEM or OEM replacement alternator, which is usually enough ouput for their engine, battery lighting and perhaps a few accessories. Many OEM alternators don't put out and operate well enough other than for street driving with a few accessories. The OEMs are really only a bare minimum when it comes to alternators.
Most of the aftermarket puts out OEM replacements which may be a hit and miss as they often fail or may fail after a short while. If you go with an inexpensive aftermarket or aftermarket upgrade I would take a look at the warranty, many are known to fail after a short while. A good OEM alternator will normally last longer than an aftermarket as the quality is normally higher.
With OEM replacements I always get one with a lifetime warranty as their known to fail after being installed a short while.
Actual High output alternator cost is significantly higher. For Denso's the prices start at around ~$400.00 for anything with any sort of quality. Older Delcos it's probably less as it's an older technology and not used in more modern vehicles.