I considering purchasing those same arms for my 87 cutlass. the sale person i talk to at speedway said the lowers are out of stock until sept. the other problem I've run into is the alignment shops I contacted said they could not do and alignment.Now that is for the uppers only, at one time there was a kit available that had the uppers and lowers together.
And I guess the kit isn't available any longer.
also I'm wondering if the stock control arm spec can be use to align the tubular arms.
the impression I got from them is that they didn't know either. it may a good ideal to check your local alignment shop in your area to see if they can.
so now I'm thinking of just going back with the stock arms since its just a daily. there's not a lot of mechanic around that can work on these old cars.