Dear Chaps,
I bought the original PO S550 from ebay and it also stated that it is for the Desire HD. When I opened it up and tried to put my DHD in it, I think I almost broke my DHD because I had to push to hard to put it in.
I was already getting mad at the ebay seller because he was selling a badly advertised item that did not fit.
But I still wanted to go on trying and what I did is fiddle with the case for 15min to make the leather nice and soft on the sides. Because it's brand new the leather is still very stiff and it needs to be made soft. Just pushing, squeezing and pressing the case for like 15 minutes made my DHD fit in a lot better. And every day it is starting to fit even better in it.
So to sum it up.
-I received the case, my DHD did not fit at all (the sim cover even got stuck in the case when taking the phone out).
-After making the case soft by squeezing it a lot on the sides the DHD fitted in it but not yet perfectly, I still had to push hard.
-now after 3 days of using the case, it fits my DHD like a tailor made suit!