Hi Debbiearl,
The 55" DU7200 TV stand can be place at either 32.5" or 10" apart, so your 43" stand should be just fine. For more information on installation services, please contact your local Best Buy or visit
https://www.bestbuy.com/site/tv-home-theater-services/tv-mounting-packages/pcmcat748300648009.c?id=pcmcat748300648009#1
~Samsung Advisor