Please any idea how to plug in Tara Labs RCA connectors very close together? Thanks

Have the outside barrels turned down. Maybe call Tara Labs. I quit using oversize connectors because of issues like this. 

Try using a RCA male to female adapter in one of the connections. One cable will be offset from the other. 

Or try a right angle RCA adapter on one or both connections.

@lowrider57 +1. My advice too! Only the neurotic will complain that they can hear it degrade the sound!

@jasonbourne52  +1. I'm waiting for those comments.

i owned top level Tara Labs interconnects, both RCA and XLR, and due to their very thick air dialectic which makes them so large, Tara Labs provide short thin extenders for the last 4-5 inches so they can be used in tight preamp/source plug in spots. these cables retail north of $30k so they have all the bells and whistles. they do sound amazing.

scroll through the pictures on this link and you will see the extenders.

https://www.taralabs.com/products/item/12-all-interconnects/87-grand-master-evolution

contact Tara Labs for how to acquire these. not sure they can be purchased separately. maybe contact whoever sold you the cables, maybe they still have them sitting around.

if it's just the plug barrel size, those sort of tight plug layouts are not typically found on higher end gear. more on receivers and HT processors. and you will likely need some sort of DIY solution to make them work. my above comments would not be relevant.