173cm / 5'8 is not short ! [Thats too close to my 176cm / 5'9" ]
The below Chinese generic tripod mount as sold by AOE and others is suitable for binos up to 80mm. For a 70mm it would be excellent. [ It says 100mm in the advertising but for a 100 mm binos you would need a heavier mount].
It reaches to 187 cm - which is about 6'2" which means you can get 'under it' to observe closer to te zenith.
With the binos - I strongly recommend saving more and buying a quality product. I have wasted thousands of dollars buying inferior optical products only to sell them and loose money. Do it right the first time. The Fujinon and Ultra range are high quality products that will give you a life time of rewarding viewing.
http://www.aoe.com.au/mounts.html
Chris