I had to rely off an old fansite last updated in 2006 to even figure out where to start looking for some of these. Most of these come from a show called 寝ドキッ！！, which miraculously was uploaded to the Internet Archive. Several are still lost, though.
寝ドキッ！！- 4/15/1999
寝ドキッ！！ - 9/4/1998
寝ドキッ！！- 7/10/1998
Hot Wave - 1998
They were on HOT WAVE several times between 1998 and 2000, but only the one clip above seems to have been uploaded. I'm hitting a brick wall with finding their appearances on other shows - they were also on MUSIC TRACK, J-BEAT, Jee Jee Trap, パワープレイミュージック, MUSIC MAP, 日刊ひっと and several other shows.
Fun Fact: Tameiki is used as the second ending theme for the anime "Master Keaton"!
Master Keaton Ending 2
月と君と僕の関係 was also used as an ending theme during the 2007 rebroadcast.
I'm going to be totally honest - I don't think any of these will ever be uploaded online. I have spent hours upon hours searching for these and I highly doubt anyone took the time to record them or upload them somewhere. I'd love to hear them, but some things really do just get lost to time.