plenty of stuff on this, it is an easy DIY just awkward to get to. The 500e was shoe horned in so may be a little more difficult. If you are wary get it done in a shop they should not charge more than 1hr labour.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)