All custom door sprites a little too small...

Hello everyone, first post here. :3 Was wondering if you could riddle me this...

http://i1077.photobucket.com/albums/w472/ScottSkullcandy/aerg_zps74428239.png~original

http://i1077.photobucket.com/albums/w472/ScottSkullcandy/arg_zps1e7338f9.png~original

Every time I download a new custom door sprite, they are always 1 or 2 pixels too short, this doesn't happen with the default doors but with every custom one I've tried so far...

Is it something I can fix? Is there a place where I can get ones that should work perfectly? Or do I just have to live with the stock sprites? D:

Thanks in advance. ^^ (Btw, I'm very new to RPG Maker. D:)

Did you try adding a ! to the start of the file name?

Trying that now, will report back, thanks. :)

EDIT:

Seemed to work on some tiles but not others, but that's okay I can deal with it, it's a lot better than before! :3

Thanks, can close the thread now. Solved!