Please review the manufacturer’s documentation before purchasing any recommended replacements for your application.
PGL6303.151HLT is an inductor from Pulse Electronics that has proven very hard to track down, at least if you are only looking for a small quantity. I have not been able find a lot of solid data on this part number other than the fact that it is surface mount, 150nH, and similar in build to other inductors with the PGL prefix.
The best match I’ve been able to find is part number 553-PGL6312.151HLTCT-ND, but there is a considerable lack of information on the original that keeps me from calling this a direct replacement.