Speeding up my TWGS

[Eric Dietrich <madscientist@treebranch.com >]

Hi.

I have a TWGS with v1.5 ROMS.  It runs at 6.something Mhz and has 8k
cache.  The
machine is comfortably fast, but more speed never hurt.  I have heard
conflicting
stories on cache, ROMs and GALs and the like.  Anyways, I was thinking
that perhaps 
8 or 10 mhz might be possible, and as far as I know, the only damage I
could do would
cause crashes and not permanent hardware damage.  So...

Where can I get crystals for 8 and 10Mhz?

If it dosent work, does anyone have (or still sell) that little ROM/Cache
board?

This isn't a priority, but if I can spend a few dollars and get a little
more speed
then why not?

-Eric