Hello vintage drum resto folks

I normally enjoy finding and/or restoring vintage mij kits

but just recently I found some clear Ludwig vista lites

A 22" bass 16" floor tom and unfortunately

a 14" concert style tom as the mounted drum

the kit came with a greyish orange peel acrolite snare

Missing is one 1/2" curved spur the reso side head and hoop

and the 781 tom mount

I will at some point end up with a 13" double headed tom

to replace the odd ball concert tom

Today I bought the tom mount on eBay

but was a little bit confused by the length of the main tube

which is like 20" most I have seen are about half that length

In the description written by the eBay seller

It was mentioned that this particular tom mount came from a 1976 vista lite kit

I figured that was what I needed and pulled the trigger

but gosh sakes as I look now the thing seems sort of long

I have the Ludwig book but the only mention of the 781

has more to do with the evolution of the design and the changes made along the way

Nothing at all about the varied lengths of the main tube and /or why

Why is thing so darned long ? ............Thanks Kenny