Ya I need the first one. Though I'm wondering now if it would be more wise to change the braking system since it's the breakbooster thats preventing me from using the one I already have. Is that even possible or worth the trouble?
I'd bet there are a bunch of skinnier boosters that can be made to fit. Check out some of the M50 E30 swaps. They tend to use 2002 or E21 boosters. You could also relocate the booster or use the BMW E23/E24/GM hydroboost units. Both are expensive choices and require some fabrication. But since you already have the '02 booster in your '02, I'm not sure what would fit.
You might want to
email this guy, whoever he is - he specializes in this swap.
Can you 'massage' the stock booster to make it fit? It might bind internally, but those are
I know this is off-topic, but be aware that you might have EWS on the donor M42 - you'd need the later DME to run the manifold, you might also need the EWS sender ring, original E36 ignition key, and code box.