i have used a few suppliers over the years,real steel(building up my kitcar engine) were ok,but now i use mostly paddock spares or island 4x4(range rover),i know a lot of people slag off paddocks but they also do oem on lots of stuff,they are cheap,free delivery,i used the head gaskets on my 4.6 done 10k and no problems.island 4x4 seem cheap also oem height sensor £40 dealer would want twice that probably just for it to come with land rover on the box.its your money but just because its more expensive doesnt mean its always better.