Quote: The bosses on the end of the Magnum heads are all on the same plane... on LA heads, the bosses are on different planes (for a visual, you can probably stand a Magnum head on it's short end and it will stand, but try that with a LA and it will be precarious or impossible). You may need lots of washers to shim the Magnum brackets on the LA heads, which may or may not be stable.