Well Nathan it would seem when you buy this item. Like when you buy shoes etc you need to state the size in the sellers message box.
Just make sure you write 52mm ring when you buy it and all should be well.
'Available Adapter Ring: 52, 55, 58 and 62mm ring sizes' this i copied from the link you gave, so yes you can get the 52mm ring
Also a bit off-topic here. You posted last night that youre getting the D80 body ina few weeks, yet here you say youre not upgrading now? until next year
, slightly confused hehe.