one day those 2 fender twins will surface, but as of now, they are kept under lock and key and mums the word on their location. i have made contact with parish, healy, cutler, GDP, and so on but have had no luck in locating them. HOWEVER, we do know a TON of info from the actual guys who did the work. up until the WOS dismantling, alembic did the work on them with Wickersham running the show, Janet Bowman aka Jim Furman, did the alembic work on jerry's blackface twin. so we know what was involved during that period. but after the WOS, healy became the boss. he is also the guy that ALL the roadies point to in any question regarding the mods in them, and that is where the majority of the mods i have came from. straight from the man himself. so while they are not accesible, over the past few years we have uncovered what we feel are the key changes and the results speak for themself.
that all said, i have a theory that the blackface was actually alembic modded, and the silverface was healy modded. the two ways are super close in tone, but do have differences. guess it just depends on what era your after.