reduction gear starters

[Dave Fain <kc3565l@sprintmail.com>]

I am thinking of installing one of those reduction gear starters in my newly 
rebuilt GT6.  Does anybody have one of those handy so that they can measure the 
length of the part that sits in front of the rear engine plate?  My engine has 
tubular headers and I am concerned about the starter interfering with the 
header pipe.  Things are so tight that one of my spare Lucas starters won't fit 
because it hits the header.
thanks,
Dave