Getting Slam on a Quadruped Eidolon

[Yropro]

My gf is playing a summoner and wants an Elk form eidolon. I'm trying to help her make it as a quadruped and noticed hooves suck since they do the same damage as claws but attack at a -5 penalty. So I figured I'd just give it slam attacks instead.

Per Slam for Eidolons: An eidolon can deliver a devastating slam attack. This attack is a primary attack. The slam deals 1d8 points of damage (2d6 if Large, 2d8 if Huge). The eidolon must have the limbs (arms) evolution to take this evolution. Alternatively, the eidolon can replace the claws from its base form with this slam attack (this still costs 1 evolution point). This evolution can be selected more than once, but the eidolon must possess an equal number of the limbs evolution.

Well s!$*, it has 2 Leg evolutions, no arms. Unfortunate.

Then I noticed the Mammoth Eidolon Model from Ultimate Magic.

Mammoth
The eidolon is a large, powerful creature with tusks and a
prehensile trunk (using the tentacle evolution), such as an
elephant or mastodon.
14 points (20 points for Huge): Base Form quadruped;
Primary Evolutions gore, tentacle; Secondary Evolutions
grab (tentacle), huge, large, mount, scent, slam, trample.

Since I see no Arm evolutions anywhere, should I just go ahead and pick slams for her?

Edit: lol, I really appreciate how the text filter is random generated every time you load the page, that made me chuckle.

[blahpers]

Eidolons, 2-Point Evolutions wrote:

Limbs (Ex): An eidolon grows an additional pair of limbs. These limbs can take one of two forms. They can be made into legs, complete with feet. Each pair of legs increases the eidolon's base speed by 10 feet. Alternatively, they can be made into arms, complete with hands. The eidolon does not gain any additional natural attacks for an additional pair of arms, but it can take other evolutions that add additional attacks (such as claws or a slam). Arms that have hands can be used to wield weapons, if the eidolon is proficient. This evolution can be selected more than once.

Either you have to take the limbs (arms) evolution or you have to already have claws to replace with a slam.

[Yropro]

Well then how does the mammoth I quoted work?

[blahpers]

AFAIK, it doesn't. : /

[Yropro]

RIP. That's what I thought.

[blahpers]

I mean, you can still spend the points for the arms and just call 'em antlers...?