The DSS ones will be the std Honda plastic. I managed to fit them OK, but you need a flat hard face to bash against, and you need to make sure it's on square otherwise whilst you're bashing them in the flanges will just shear off the bush.
I used a hard plastic disc. With a long M10 bolt through the centre of the disc, I put loads of tape around the bolt to make a tight fit 'spigot' that I pushed inside the bush. That kept the disc square to the face of the bush. Might have a pic if it helps.
