my manufacturer made a mistake in the room blanks sizes
(idk how this happened with my manufacturer because I sent them exact measurements everytime)
 
( this is for most of the older room blanks) 
(WD,Garden,Brick series are not effected) 
 
These room Blanks are slightly smaller than the room blanks and won't fit the newer attachments.  They connect nicely with each other but are slight smaller than the new room blanks and attachments. 
 
 
 
Great for If you don't really care about newer attachments or just like making single rooms