The information is from an older Wholegoods price list, but it should give you a rough idea as to the cost of the kit through Wholegoods. If you call parts it will be a much higher price, so be specific to speak with the sales department.
B7311 is a wholegoods item number, not a part number!
From Wholegoods price list (2015)
HIGH CAPACITY ALTERNATOR KIT
B7311 10 $192.00
B1700, B2100, B2400, B2410,
B7500, B7510, B7610, B2320
B2620, and B2920
B7324 10 $199.00
HIGH CAPACITY ALTERNATOR KIT
(B2710, B2910, B7800,B2630HSD,
B2620, and B2920,B3030HSD (Std. on B3030/B3000HSDC,
B3200, B3300SU)
Parts:
Using Messick's they show the following information for a kit though Part Department:
KIT, ALTERNATOR
- replaces #6C040-95300
6C040-95302 $652.83 5-7 business days 1 to equal #6C040-95300
$192 vs $652.83??? Make certain you call the right department!
Hope this helps in some small way.
Added in edit: August 2017 still shows the price as $192.00 and has other tractor models listed (2301, 2601, 2320)