Here is a picture showing the Panj Piare who laid the foundation for sri Panja Sahib Gurdwara:
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As you can see, bhai sahib Randhir Singh ji along with other prominent Gursikhs laid the foundation for sri Panja Sahib Gurdwara.
Here is a picture of bhai sahib, bau mal Singh ji and I believe bhai Visakha Singh ji who was one of the Panj Piare in the above picture:
I am not sure who sant Budh Singh ji is or baba Nidhan Singh ji, if anyone has more info please post.
ਸਤਿਗੁਰਬਚਨਕਮਾਵਣੇਸਚਾਏਹੁਵੀਚਾਰੁ॥