Looking for x900 head and dampers

I just wondered if anyone could recommend me a reliable shop with epson spare parts. I need a head for 9900 and a set of dampers.

So far this shop is offering a very good price on the head http://oridigital.com/product.php?id_product=23
However I have some doubts since you can't pay with credit card or paypal

Also I don't know what's the difference between F191010 and F191040

I have found two of F191040 but only in UE and their price is pretty steep:
http://www.gedat-spareparts.com/index.php?sess=209120121213628182472&model=STYLUS%20PRO%209900&refnr=523&artnr=F191040&action=epsdetail
http://hardware-planet.co.uk/epson/print-heads/f191040/print-head/#.UP-XXjWWyTI