Brake pedal - series 1 vs series 2

I recently ordered a series 2 smallframe brake pedal (30038000) and it doesn't fit my frame. The lever arm is 5-10mm short and doesn't fit cleanly through the hole in the floorboard.

The original pedal does fit cleanly so I suspect I might need to get a series 1 pedal. Can anyone tell me if the series 1 brake pedal (30038500) has a slightly longer lever arm?