1970 chevelle buckets side bolsters

[Spencerforhire]

I am in the process of recovering my bucket seats and was wondering if any of you have had experience putting the listing rods in the sleeves of seat covers and connecting it down to the listing rod on the seat springs. I purchased new foam but it came and they do not have the slots in the foam so I am going to make the slot my self. Any advise would be greatly appreciated.
Thanks,
Scott