Is there a template or example of a J&A to add the 52.217-8 clause to an already existing Task Order.
It's questionable if a J&A is required simply because the subject clauses weren't included in the task order. The task order is subject to the terms and conditions of the basic contract, which included the -8 and -9 clauses. The contractor is bound by the basic contract regardless of who administers the contract. In any case, you can find helpful J&A links at this DPAP website
. More basically, the J&A must include the content shown at FAR 6.303-2