QUOTE(PaulLeMay @ Aug 13 2007, 03:32 AM) [snapback]349167[/snapback]
They are different. Streamlined pens are a little narrower at the top, so the clip is smaller in diameter. Flat tops are bigger. Then you have different sizes for junior and senior. Then I have seen some other sizes as well.

Thankyou for the answer and the excellent pictures. I have need of the clip for the flat top Parker fountain pen. Do you know of any one who has one for sale? My Red Parker Senior? duofold is 14.1cm without a clip. It is 15.48mm at the point where the orange meets the removable black top. Thanks for the help.
Pamela