If you don't have one you should look for a 21 parts manual. You can use the one on this site for reference but some of the numbers don't match up correctly so be careful using it to order.

After you get a list of part numbers for the bodywork and or decals you can send them to Redline here in California or any number of part shops in Europe.

The bad news as has been posted is the 21 decals and bodywork are getting hard to find. The 28 is getting the same way. I tried to order all the decals for my Rothmans and two of the main decals are no longer available.

I thought that the 28 lowers are different than the 21 so do more research on that before ordering 28 pieces.

Just to give you an idea I bought a new tank for my Rothmans and it was $800us including shipping. The complete bodywork was $2200us including shipping.