[DeTomaso] ZF front seal part numbers?

[MikeLDrew at aol.com]

Hey dudes,

A guy pinged me today looking for the number of the ZF front seal.   He 
happens to have a Dash-1 gearbox; I don't know if the early and late gearboxes 
use the same seal or not.

As always, I turned to Bill Taylor's gearhead database, but this is all 
that I could find there:

front seal PN #   B1Vi   30   42   7 CFW 1      30 (mm ID) x 42 (mm OD) x 7 
(mm Thick) are the significant numbers   can be had from Rolf

So, who the hell is Rolf?

And does anybody have more concrete information that I can pass along?

THANKS!

Mike