Ferodo DS2500 FCP1639H-N vs FCP1639H
 

In most cases it seems that the FCP1639H also lists the WRX and the FCP1639H-N only lists the BRZ.

There are a number of sites that list one or both for the BRZ. In some cases the price differences is $15 or more. What is the difference if any between the two part numbers?

The same is true for the rears as well. FCP4187H vs FCP4187H-N.

@JRitt might know. I just picked up a set of DS2500 rears from him; I'll check the P/N when I get home.

The part numbers with and without the N suffix are the same. For example, FCP1639 is Ferodo's part number. The N is an Essex designation for our in-house item numbering system. If you see that listed, the reseller probably just took our part number and listed it on their site. Since all Ferodo sales in North America are funneled through Essex (we are the importer/distributor), they are buying from us and selling to you.

So any of those part numbers you listed will be the proper pads if you order them. My advice to you would be to buy from whoever has them in stock and can provide you with the best customer service.