Jota seat hump hole positions

[Dingocooke]

Hi All, I'm after the dimensions for the positions of the seat hump mounting holes, particularly the two side holes that take the brackets onto the frame; if anyone could measure one that would be great? Reason for the ask, is I have a large gap between the seat and hump, and adjusting the brackets isn't helping; as the hump appears to have been filled and repainted, then drilled, I suspect the 'new' holes are set too high, lowering the hump (if that makes any sense!!)
Thanks in advance,
Cheers,
Steve

 

[Grant]

Do you mean the seat hump or the plastic tailpiece?

 

[Dennis]

Hi Steve, I assume you are referring to the ducktail and brackets. On my 79 Jota the centre to centre distance between the bolt that goes through the rear of the frame and the chromed slotted bolt which attaches the ducktail to the bracket is 5.5cm. The chromed bolt is about 1.5 cm higher than the frame bolt. Hope this is making sense. I can post a photograph if that would help.
Dennis

 

[Dennis]

Hi again, see attached photo; should be reasonably accurate. The ducktail is attached to the chassis at 3 points: L and R brackets and one to the tail light assembly (bottom right in the photo). The chromed slot head screw on the top of the tail simply attaches the outer ducktail to the inner part. I think the key to getting this set up in the correct position is to get that third mounting point (ie: where  the inner piece attaches to the tail light assembly) correct. All else should then fall into place.
Dennis

 

[Grant]

Sometimes the brackets need to be persuaded so that everything lines up and the seat closes without fouling the tailpiece.
Sometimes some holes in the tailpiece inner need to be elongated.