ebay think its under cat scratching post tho
B&Q, plank of wood for about a fiver, and one carpet tile
Take saw, cut wood to right length
Apply carpet on ramp as it is simply the best thing for piggies to grip on, loads better than just raised bits on the ramp.
Attach with hinges or fit in the old gap if you have one/cut it right
And to be really posh, make a 'bannister' from clear corrugated plastic
I had great fun making mine (although Mummy DoeyL was not impressed that I accidently sawed part of our garden bench off...do not use a garden bench to rest your wood on...)