I have an 1998 S Reg E39 528i and a few weeks back fuel gauge stopped working completely - no warning just didnt move at all when I started the car. The trip computer has stopped working too and is just showing "--- miles" on the display.

I left it into BMW today and they have told me it needs a new fuel sender unit and want they are gonna charge about £170 for the privelege . I have looked online and I can get the part for about £25 and it doesnt look a big job to replace myself but the problem is there is an option for both "E39 FUEL SENDER RT-HAND SIDE RIGHT-HAND SIDE" and "E39 FUEL SENDER LFT-HAND SIDE LEFT-HAND SIDE" and Im not sure which I need or if indeed I need both, anyone got any ideas?

TIA

Jase