A. M. Shastri estimates the reigns of the Sharabhapuriya rulers as follows: based on Sharabha's identification with the Sharabharaja mentioned in the 510 CE Eran inscription, he assigns Sharabha's reign to 475–500 CE (assuming a 25-year reign). Similarly, he assigns 25 years to the next two kings. Since Jayaraja's latest inscription is dated to 9th regnal year, Shastri assumes a 10-year reign for Jayaraja, and some subsequent kings.

Sharabha (Śarabha), c. 475–500 CE
Narendra, c. 500–525 CE
Prasanna, c. 525–550 CE
Jayarāja, c. 550–560 CE
Sudevarāja, c 560–570 CE
Manamatra alias Durgarāja, c. 570–580 CE
Sudevarāja, c. 570–580 CE
Pravarāja, c. 580–590 CE
Alternative dates have been proposed by other historians. For example, D. C. Sircar estimated Sharabha's reign as 465–480 CE, while V. V. Mirashi estimated it as 460–480 CE.
Who was the ruling member of the Sharabhapuriya dynasty in 575 CE?
Based on that paragraph, the ruler during 575 CE was Sudevarāja, who ruled from c. 570–580 CE. Note that this may be an estimate, since all of the time periods listed have a "c." (short for "circa"), which indicates some uncertainty about the time ranges listed.