Sugar Bear, thanks for your above message. I found Helicoil 5546-6 M6 x 1 Metric Coarse Thread Repair Kit on Amazon. Is that the correct size and length for both m6 x 50 bolt and m6 x 65 bolts?

I can't see to find Helicoil m6 x 1.5 Helicoil repair kit will work on 1 m6 x 50 bolt and 1 m6 x 65 bolt? or does that matter? What would be correct Helicoil thread repair kit based on the bolts size as mentioned above?