In the Wall Street Journal an influential Saudi former military commander talks about making common cause with Israel - April 21, 2015
"Anwar Eshki, a retired major general in the Saudi armed forces, has spearheaded Riyadh's outreach to Jerusalem. He made history in June when he appeared on a panel in Washington, DC, with Dore Gold, the newly appointed director-general of Israel's Foreign Ministry. At that event, Gen.Eshki outlined a vision for the Middle East that included Arab-Israeli peace, regime change in Tehran, democracy in the Arab world and the creation of a Kurdish state."
Saudi Arabia doesn't even have formal diplomatic relations with Israel, but the kingdom's hatred of the Iranian regime is such that it's willing to collaborate with Israel to let it attack Iran
Letting Israel Attack Iran
'Saudi airspace open for Iran attack' - Jerusalem Post June 13, 2010
The Post discusses the recent story in the London Times that says the Saudis have practiced "turning down" their air defense system for an Israeli flyover on its way to attack Iran. The London Times article by Hugh Tomlinson said, "To ensure the Israeli bombers pass unmolested, Riyadh has carried out tests to make certain its own jets are not scrambled and missile defence systems not activated. Once the Israelis are through, the kingdom's air defences will return to full alert."
Saudis ‘would let Israeli jets use their air space to attack Iran’ - Times of Israel, Feb. 25, 2015
“The Saudi authorities are completely coordinated with Israel on all matters related to Iran,” the European official in Brussels said.