Deckel FP1, Maho SK250 Dividing Head

If anyone has the OE Dividing head and overarm support for an FP1 or SK250 would it be possible to get the length of the overarm support please ? I have the dividing head but i'm going to have to make a replacement support and while i can "guesstimate" its shape from various pictures i'm confused about its length. It would be nice to get the length about right for visual effect if nothing else.

Thanks

Mike Young