Is there a specific number of days that you must give an IRA CD holder in case of an account with an automatic renewal? What is the mandated grace period after that renewal during which withdrawals are permitted without penalty??

I don't believe you need to offer a different length of grace period to accomodate your IRA CD holders. The grace period should be the same as you currently disclose for your non IRA CD owners.

Plus, you can waive some or all penalties on a IRA under these conditions:

(a) Where the time deposit is maintained in an individual retirement account established in accordance with 26 U.S.C. 408 and is paid within seven days after establishment of the individual retirement account pursuant to 26 CFR 1.408–6(d)(4), where it is maintained in a Keogh (H.R. 10) plan, or where it is maintained in a 401(k) plan under 26 U.S.C. 401(k); Provided that the depositor forfeits an amount at least equal to the simple interest earned on the amount withdrawn;

(b) Where the depository institution pays all or a portion of a time deposit representing funds contributed to an individual retirement account or a Keogh (H.R.10) plan established pursuant to 26 U.S.C. 408 or 26 U.S.C. 401 or to a 401(k) plan established pursuant to 26 U.S.C. 401(k) when the individual for whose benefit the account is maintained attains age 59 1/2 or is disabled (as defined in 26 U.S.C. 72(m)(7)) or thereafter;