I use 3racing 2.6mm horns in all my ansmann models
http://www.ebay.co.uk/itm/3racing-2-...item256af57ab7
I think the 75mm would be ok for the front, and circa 90mm for the rears.
I have a full set of X2C alloy threaded shocks and spring you can have for £35 posted. I run big bores on mine so dont need them
You can see them in the pictures on modelsport
http://www.modelsport.co.uk/ansmann-...products/39363