Do I have to do a J&A to add the clause since the current contract is a sole source contract.
I cannot give you the "firm, correct answer". How you proceed is a judgment call. My recommendation: I would not unilaterally add 52.217-8 to the current contract. The price of the extra 6 months was not evaluated when you awarded the contract. The authority to extend the current 8(a) contract, using 52.217-8, does not exist. Normally I would recommend that you do a "bridge contract" - something that bridges the work effort from the original contract to the one you are currently negotiating. Sometimes you can do a bridge contract with a short term/low dollar contract, using a Gov't credit card.
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Another way would be to do a J&A and negotiate a short term contract with the 8(a) company. According to your scenario, you have already modified your current contract to extend the period of performance - without any authority to do so because you did not have 52.217-8 on your contract. I would recommend that you do a J&A and document the reasons why you extended the period of performance on the sole source contract and your plans to award a new sole source contract to the same 8(a) in the near future. Make sure you have documented how you determined that the Gov't is paying a fair and reasonable price for the additional work, especially if you increased the price of the work effort as part of the extension.