Mod Details
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![451 ED 451 ED](https://www.evilution.co.uk/wp-content/themes/evilution/images/evilution/model3949.png)
![451 Fortwo 451 Fortwo](https://www.evilution.co.uk/wp-content/themes/evilution/images/evilution/model6.png)
These are the part numbers that you need to take a smart dealer.
A4518600087 or the updated version A451860187 x1 Isofix frame
N000000003120 x4 bolts
N000000003175 x4 nuts
A4518680039 x2 covers
Here is the frame, the 4 nuts and 4 bolts. I didn’t get the covers.
![](/wp-content/uploads/smartinterior/isofix/451/iso2.jpg)
Go to the passenger’s side of the car, fold the seat forward…
![](/wp-content/uploads/smartinterior/isofix/451/iso3.jpg)
…and then throw yourself down the back of the seat.
![](/wp-content/uploads/smartinterior/isofix/451/iso4.jpg)
Each side of the seat, just above the runners are a pair of holes. If you have a zip tie, cut it and remove it.
![](/wp-content/uploads/smartinterior/isofix/451/iso5.jpg)
Place the frame against the seat so the metal loops pass between the seat back and cushion.
Put in the T45 bolts and place the 13mm nuts behind. This is a total pain in the arse.
![](/wp-content/uploads/smartinterior/isofix/451/iso6.jpg)
Tighten the fixings on both sides and fold the seat back up.
![](/wp-content/uploads/smartinterior/isofix/451/iso7.jpg)
If you bought the covers, these now push in from the front. I didn’t have them so I didn’t fit them.
Important
With the frame fitted, you now need to consider your next move.
If you are using a front facing child seat and don’t have seat side airbags, you are good to go.
If you are using a rear facing child seat or have seat side airbags, read this.
You will have to go to a smart dealer to have the vehicle card updated, the airbag off switch fitted and the car coded.
Credit
Thanks to Ermes for the updated part number.