yo, ANDY & BOSSIND installed the plastic type from E350s in their broncos; see post by Andy in his 90 here;
http://www.fullsizebronco.com/forum/showthread.php?t=96250
In Boss's install post, he wrote; "...Bought the boost off of ebay its for a 2001 e450/f450..."
PM Andy; haven't seen him here for a few months though.
this is by Ford athttp://www.fordparts.com/Commerce/CatalogResults.aspx?y=2001&m=Ford&mo=E-350 Econoline#Search
Brake Master Cylinder
with speed control - - with booster ID# XC25-2B559-E* ``BEFORE 10/26/01''; Master cylinder
BRMC-54 $160.40
Brake Master Cylinder
without speed control - with booster ID# XC25-2B559-FC ``FROM 10/06/98 TO 10/26/01''; Master cylinder $198.57
Brake Master Cylinder
Superduty; Master cylinder $366.56 Add to cart
2140
Brake Master Cylinder
Superduty ``FROM 05/02/99''; Master cylinder $263.95
Buyer's Guide Results
Part Number:
BRMC54
Description: Brake Master Cylinder
Manufacturer: Motorcraft
Years: 1999-2003
Applications: 112
Results Per Page 10 25 50 75
Years Make Model Engine Qty per Vehicle
2003 Ford E-250 All Engines 1
1999-2002 Ford E-250 Econoline All Engines 1
2003 Ford E-350 All Engines 1
1999-2002 Ford E-350 Econoline All Engines 1