i was pointed to this part on another site 
https://www.europaparts.com/cam-follower-077109320cb.html
but in elsawin part 9 under valvetrain component overview is a hydraulic valve lifter which is supposedly not removable without being damaged and pressed into the roller rocker lever. so i guess machine work on top of the $20 part?
here are links to the old engine i’m replacing (late 07 with 122k miles. the replacement engine is an early '04 with 151k miles and it looks quite a bit better.
Initially thought valve keys were the culprit but they were still in the valve spring seat/cap and the valve stem broke at the valve keys. Adding pics to the album. Valve spring broke in half, stem broke at hat. Piston is stuck sideways in head/combustion chamber and is obvious it destroyed the piston with the contact after falling
'07 S4 BHF - Blown Piston - Teardown - 122K miles
I’ve been very slowly and with a lot of stupid setbacks working on tearing down and cleaning up the ‘new’ engine I picked up (thanks VinnysS4 for taking a look at it, way back when) with 151K miles on it. I’ve just about completely disassembled and cleaned the old heads, will be lapping valves/seats soon and then cleaning/surfacing deck then begin reassembly with full timing kit (had typical single guide failure - was not nearly as bad a crack as the guide on this broken engine it’s replacing) and moving accessories/goodies from old engine to the new, then throw her back in and pray I did everything correctly. That said, I finally tore into the old engine to get a new rocker roller lever to replace one I broke removing the valve stem seals in the ‘replacement’ engine heads.
Some things I noticed:
[]Old engine with 122K miles had a more destroyed accessory guide than the engine with 151K miles
[]Old engine (2007) does not have oil deflectors between the bearing caps. The ‘new’ engine from an early 2004 had 2 oil deflectors between bearing caps in the bank 1 head, and one oil deflector in bank 2 head
[]Old engine (2007) bearing cap bolts (T30, use impact or extension, break seal quickly - do not go slowly) came off a lot easier than the 2004 engine which, even with impact type force was twisting t30 bits. I did strip one bolt on each engine but was able to extract with a bolt extractor.
[]Old engine (2007) rocker roller levers are a different color and have a slightly different look/design to them than the 2004 engine. I’ll be inspecting closer as I will be hopefully (don’t see why not) using one from the 2007 engine in the replacement 2004 engine.
[]Old engine (2007) has possible scoring on some cylinder walls and the 2004 did not, yet some knock indication (scuffing) on several cylinders
[]Valves on old engine (2007) look way worse (dirty) than the valves on the 2004 engine (30K mile difference as well!) - link to the 2004 engine head job: '04 S4 BHF Valve Job @ ~150k miles
Let me know if anyone wants closer/better pictures of anything for comparison or reference purposes.
