Ever since they mentioned being a bit wary of buying third-party things online for cords and such, I usually just get them through the official store now. I bought four new cords and two new chargers, along with a car one, even though it was like pulling teeth since the HTC store is known for not having everything in stock at the same time.
At the very least, I'd get the cords from HTC and then, if you're comfortable and read enough online, use the old chargers then.