TRIDONIC gear tray including magnetic ballast, starter, capacitor, lamp clips and with the T8 lamp holders as shown which are attached to approx. 94cm cables 

This is for 1 x 36w T8 4ft tube light and is as shown

The gear tray itself is 37.6cm long x 5cm wide

It has a max depth of 5cm

On the ballast it says it is capable of running an 1 x 36w T8 , 1 x 36w TC,  1 x 38w T8 or 1 x 38w TCDD

You would need to change the lamp holders to use anything apart from a single T8 tube

please see the pictures including the close up of the specifications of the ballast

These are brand new ballasts, there may be  scuffs / stains due to storage.