Simpack - Simpack rail modeling

Hello,

I am student working in the field of rail vehicle technology. 

I make High Speed Railway Vehicle

But, I don't know made some part.

The part is Suspension(Bush-Spring-Damper)

I have Specifications, But it doesn't contain mass, CoG and MoI.

So, I use only Stiffness, damping coefficient.

pls Help me.

*I will attach a model photo below

Simpack