A201 You could always homebrew him one. E.g.,
Four-Armed Dire Ape
Size/Type: Large Animal
Hit Dice: 7d8+13 (35 hp) [Multi-Headed increases HD by 2, so adding two arms likely does the same]
Initiative: +3
Speed: 30 ft. (6 squares), climb 15 ft.
Armor Class: 16 (-1 size, +2 Dex, +5 natural), touch 11, flat-footed 14 [+1 NA for being a slightly tougher AKA higher-HD'd ape; plain animal racial HD doesn't give much so you might as well throw them a bone or two]
Base Attack/Grapple: +4/+13
Attack: Claw +10 melee (1d6+6)
Full Attack: 4 claws +10 melee (1d6+6) and bite +4 melee (1d8+3)
Space/Reach: 10 ft./10 ft.
Special Attacks: Rend 2d6+9
Special Qualities: Low-light vision, scent
Saves: Fort +7, Ref +8, Will +6
Abilities: Str 23, Dex 16, Con 14, Int 2, Wis 12, Cha 7 [animals and other unintelligent beasts should get about 1 bonus ability score per HD as well as the normal ability score bonuses every 4 HD. If you disagree, lower this guy's Str and Dex by 1 each.]
Skills: Climb +14, Listen +6, Move Silently +5, Spot +7
Feats: Alertness, Toughness, Weapon Focus (claw) [For fun, change two of his feats to Power Attack and Leap Attack, but that'd definitely be worth an extra CR or 2]
Environment: Warm forests
Organization: Solitary or company (5-8)
Challenge Rating: 4 [CR +1 from normal, an extra 19 damage on a full attack but he's still a plain old brute so making him CR 5 or 6 is just asking to be the wizard's bitch even moreso than normal, plus he's not as dangerous as a manticore or a troll, but he could be about as scary as fighting a minotaur or owlbear]
