Hi Guys I have a conversion plate for fitting a top box to your kymco 125/300 It is made by Givi and comes with all the required fittings to attach it to the rear grab rail of your scooter. Cost new £86.00
I also have a top box Givi (E450N) it has a 45 litre capacity large enough to take 1 and 1/2 full-face helmets, it comes complete with mounting plate to fit the conversion plate listed above. Cost new £114.28
I would like to sell the whole package for £90.00 if you are interested you can email me for photos etc, etc hope to speak to you soon
