Greetings,

I'm in the process of replacing my 02 X5 E53 3.0i M54 head, and when re-installing the lifters I noticed that there are 4 different types of lifters on the the exhaust side.
I checked my donor "head", and all of lifters are the same both sides int & exh.

I was was wondering if anyone has come across this and do I need to match them all.
I have attached images.

Thanks for your time.

Attached Images