I've got a Crawler set and a Mule set in 2 of my Eclipses. There's not a huge difference between them although the Mule is lower output, more gravelly and has more treble, whereas the Crawler is smoother, higher output and has more mids; we're talking quite small but noticeable differences. Of the two, I prefer the Crawlers in the Eclipse and end up using that a lot more. Over the years I've tried an embarrassing number of different Bare Knuckle pickups in my Eclipses (Rebel Yells, Nail Bombs, Crawlers, VH2s and Mules) and of all of these, the Crawlers were the best match.