RB5-shocks

[Lowie]

I have an RB5 MCS. I assembled it, starting from an RB5 that I bought second hand.
It came with special rear shocks.
I noticed this after buying another RB5 from a friend. He sold the RB5 that had hardly ran, together with a lot of spares, rims, .. for about € 100,00.
This car was an original RB5 and had silver-coloured Rear Shocks, while mine are darker, more goldisch.
They also seem a bit longer then the silver shock-bodies.

Can someone give me some more info on the RB5-shocks?
different types, advantages, purposes, ... part numbers?

thx!
Lowie