The flattest part is 3/4". The "J" or "V" hook part is 1/4" and is what snaps into the casement window to hold it in. there is a little "lip" on the opposite end of the hook end that hugs the window and allows the casement to open and close without pulling the weatherstripping out.
The windows were new in 1992 and now I need to replace the weatherstripping on about 10 windows.
I did not see an exact replacement on your website thumbnails but maybe an approximate part will do. Please advise.
Thanks,
Kevin