I have recently replaced the four rubbers on the sides of the bonnet using some NOS ones from ebay, and noticed the two adjustable front bump stops were very perished, deformed and barely hanging on. After some investigation I have found that the ones on the fastback are identical to those originally fitted to the Mini Clubman. These are available new and relatively cheap from several suppliers on ebay!
Alternatively call into your local Peugeot dealers, they were still used on the 407 estate rear hatch and maybe others from range just show parts dept a picture.
Sometimes I think laterally, but then I have to get up!