Question cant find any modules for my power supply

[thisnamebad]

so i just got a old gaming pc for $15 and this old power supply was there. decided to use it as it is better than my old one. but i am upgrading and need more pcie ports. the power supply has ports on the back for adding in more pcie plugs but i cant find them anywhere. if you know of any sites that sell them please let me know.
the model is a RF-500WPS2
heres a picture of the back port. pic

 

[rolli59]

If it is better than your current PSU the current is worse than bad.

 

[Dark Lord of Tech]

You need a new PSU , THAT ONE IS VERY POOR QUALITY.