On the JEGS website it differentiates the Magnum from the LA.
The LA is described as: JEGS One-Piece Oil Pan Gasket 1970-1990 Small Block Chrysler 360
And linked here:
JEGS 210495: One-Piece Oil Pan Gasket 1970-1990 Small Block Chrysler 360 | JEGS
The Magnum is described as: Milodon One-Piece Oil Pan Gasket Chrysler 360
And linked here:
Milodon 41007: One-Piece Oil Pan Gasket Chrysler 360 | JEGS
I didn't catch this before, but the LA version is branded a JEGS product. But it looks nearly the same as the Milodon, so I'm guessing Milodon is actually manufacturing … well, both.
I can't vouch for the fact that it really is an LA one piece gasket … but that's what it is advertised as.
