If the album has the CD-4 sticker, then you have the CD-4 version of Puka Shells (GNPS-2091).
If it doesn't, you probably have the EV-4 matrix encoded version of the album (GNPSQ-2091). I wasn't aware of an EV-encoded version of this album. I only saw the CD-4, and thought it was a single-inventory release. I think it was the only title GNP released in quad.