The only source I know for daylight filters is Hutech itself here bottom of page.
http://www.sciencecenter.net/hutech/canon.htm
Work out which one 58,67 or 77mm and just get step up/down rings to fit any of your lenses. Here
http://www.centre.net.au/Step_Down_Rings_0007LP.html
http://www.centre.net.au/Step_Up_Rings_0007LN.html
I am going to get the 77mm.
You can meanwhile fix up the colour balance in Photoshop.
Bert