Good work. Was considering doing the spacers on my z as well but I ended up going with Energy Suspension subframe and differential bushings. Have yet to find time to get the bushings installed though, probably going to be doing it myself (my dad will be around if needed) which should be interesting.
At least one of my subframe bushings is leaking silicone though, so that's kinda why I went with actual bushings. Curious if you had any leaking?