Just ordered a pair of these (under $50 with shipping) and they're a million times better than the ones that come with the set. They don't fit in the case perfectly, but will still fit in there. I found the plastic ones to not be sturdy enough with prolonged use, they would tilt down no matter how much I tightened them. When you tighten these, they aren't going anywhere. Also, the arm of the mount is centered on tube which makes more sense. I've heard reports of some people tightening their included superlux mounts so much that the plastic snaps so these seem like a pretty cheap and sturdy replacement option.
These come with 5/8" threads, so if you want to use the Superlux T-Bar with them, you'll have to take the adapters out of the plastic superlux ones...just use a butter knife to unscrew the threads in there.
According to the website, they work on:
MXL 603 / MXL604 / Neuman KM184 / Neuman KM84 / AUDIX SCX-1 / AUDIX SCX-25 / AUDIX F-15 / AUDIX ADX-51 / RODE NT5 / DPA 4000 series / B&K 4000 series / EARTHWORKS mics / AKG C451 / AKG C460, AKG C60 / ADK SC-1 / SC-2 /SC-T / Audio-Technica 4041a/4049a/4051a/4053a / Beyer MC 930 / M-Audio Pulsar / Microtech Gefell M294/295 /300/ SMS 2000 / Okatava MC 012/101 / Sennheiser K6 / SHURE KSM137 / KSM141 / SM 81 / SM63 / Taylor Hohendahl Engineering T.H.E. KR-33A/KR-2W/ KR-25A/KR-1F/KR-2C/TT-3M / SAMSON CO2 , CO2H ,SUPERLUX SMKH8K
http://www.avantelectronics.com/SSM.htm