Is it possible only to buy receiver end if I am already using EZ Bridge LT+ product?

Yes, it is possible. The second receiving antenna is what we call EZ Go+

There are 2 main requirements so you can have another receiver in your EZ Bridge setup.

1. Make sure the 2nd receiving antenna would be within a 35-degree beamwidth of the transmitting antenna (side A) if you have the EZ Bridge LT2+, 25-degree beamwidth for the EZ Bridge LT5+
2. You would need to order an EZ GO+ that matches the frequency of your EZ Bridge. EZ Go 2+ for EZ Bridge LT2+, EZ Go 5+ for EZ Bridge LT5+

https://tyconsystems.com/ezgo-0214+/