Product review (3 stars): It's hard to buy this stuff confidently with so little info available
Update: I decided my original one-star was unfair because this is the one listing for a Westinghouse fan blade arm that does in fact give enough information to make an intelligent decision.  I think I confused this listing with the others.  I recommend a site below based on their catalog, but when I tried to order a set of what I think is exactly what I need I found that you can't do that on the web.  I tried to order by phone but got an answering machine.  They aren't open on Saturday and they aren't open all day during the week.  I left a message and will try again on Monday.

Original "review": Not enough info to be sure the thing will fit my fan.  I actually ordered this because the write-up suggested that at least the holes on the end that connects to the fan motor were the right distance apart (I need 2 and 1/16 inches).  This would have been my second attempt to get the right replacement part.  But I found a better description of this item on Home Depot's site and it appears that the end that attaches to the fan blade won't work.  So I cancelled it.  Meanwhile I found a site called CeilingFanParts.com that has several types of fan blade arm replacements.  Most importantly they tell us exactly where the three screw holes on the blade part and the two holes on the motor part are positioned.  If this fails I'll buy a whole new fan.  I have already wasted way too much money and time on this project.