Small one fuel pump, large one fuel filter.
You wouldn't have an SLS on a 420 but if you did they are called accumulators affectionately referred to as the coconuts Yours are simple shocks that are very easy to replace. If you have SLS you will need to remove the rear passenger seat to access the hydraulic feed to each one if they need replacing because they are leaking otherwise just replace the accumulators and bleed the system.

Make sure you are not leaking oil from the head itslef.