This has been on the list before.  They supposedly work well in dry
climates.  Unfortunately, there are no prices here, you need to get a
quote.  Sounds expensive.
http://www.swampy.net/
--
Stuart MacMillan
Seattle

'84 Vanagon Westfalia w/2.1
'65 MGB (Daily driver since 1969)
'74 MGB GT (Restoring sloooowly)

Assisting on Restoration (and spending OPM):
'72 MGB GT (Daughter's)
'64 MGB (Son's)

Stripped and gone but their parts live on:
'68 MGB, '73 MGB, '67 MGB GT