What you need is a Garden Vaporizer sprayer, some warm water and a dash of Fairy Liquid.
Spray the the area with this solution and providing the bonnet and water are warm you should get most if not all creases out.
You need to buy a "Squeegee", a small plastic spatula, one side kind of fealty and the other side sharp. I guess you can get these from Livery specialists for a small fee.
Make sure the area is wet then you can get the position you need, do this by placing the stripe on the bonnet then stand back to see how true it looks.
Run the "Squeegee" over the stripes dispelling all the water and soap once in place.
Make sure before you do all this, that the area is Extremely clean free from any grit, tiny bubbles caused by these are a pain in the A*rse and are never recoverable. 
Use a sharp Stanley knife blade to cut off any excess, and for gods sake don't get the blade near the paintwork 
Give that geezer on ebay the finger from me too 
Rams