i dont remember the  name   of it   .it  was  inexpensive .  any one that will fit  a strat  with  the  same pivot pin spacing  will work.

in my case  it  was   mysecond transplant  into  an epiphone  dot  studio body..  that presented  alot   of problems   because   there  not  setup in any way to recieve  a fender  style  tremelo setup.

in this  case  i  chose  the  six  screw  old  style  mount  as i thought  i would  work  better  in my situation..

  you can   probably see that this  was a much  more involved  project

as i remember   when buying   the  graphtech  pickups    i had  to get the   ones  for   import  strat  rather  than   us   made  strat.  so id  guess   that   if your  gonna  replace the  whole  trem  you  would have to go the same  route.  also the same  if your   just going to by the block.  i had a few   blocks form  ones that i had  changed  and   some  matched  up to the  hole  pattern and others  did  not  .

  ive also seen  brass blocks  on the market  but  not  sure  if the steel  or the brass  would  ring  more

  my other  thoughts  on this   the  tremelo plate  shouldnt  be  touching  the  body in any way  directly.    it  has  to properly float   or you loose  sustain.. also   the   pcb board  being  taped  to the  trem block  as  line  6  chose  to do    helps  to   deaden  vibration..

   honestly  if  i wanted  more  sustain..   rather  than  go through all  the   block changing   and or trem  changing    having done  it  before.   i think id  opt  for a pedal.. much easier  way out  of this ..