I recently did the 1.8 coil swap due to weirdness during rain & near the mileage for them to tweak. 40 something for the coilpack/mounting bracket from napaonline.com & 36 something for NGK plug wires from sparkplug.com & some tedious time spent removing the coil wires from the fi harness to get them to reach the new mounting location then taping it all back up nice & wrapping the coil wires up to the shrinkwrapped portion. You'll have to trim the wire boots on 2 & 4 if you don't also get an older valve cover that already had these but also has sensor hole on the front of it. I have the MSP valve cover/plastic motor cover so had to trim that for wire access. Here's what I ended up with. (Yes, the oem w/k&n drop in is ugly but it's the winter setup) the SRI is going back on soon. Was checking to make sure it wasn't the source of weirdness during rain before replacing coils.........
http://www.msprotege.com/members/i12drivemyMP5/coils_1.jpg