A M42 FW will fit a M44 engine 
Can I ask what you paid for the FW? This is something I've been wanting to do after Zedonist had one made for his car. Unfortunetly he's only around as a guest periodically these days and I miss his posts as he is a well of knowledge. Was the FW readily available or custom order? Thanks, JIM
@oldcarman Hi JIM - I am not sure who the questions are ment for, but I can answer for what I have done: I purchased a used JBR FW from the US. Got the surface cleaned up, installed it with a new clutch - then good to go. New it cost $630 for the FW, I bought it used for $300 incl shipping to Norway.
There are several produsers of light weight FW, so just use good old google. But JB Racing is known for good quality.
http://www.jbracing.com/flywheel-bmw7.php