Purchased  3 layer Temperfoam for L-IV seats.  Gave seats to Upholstry guy without considering possibility of height problem,  . DUH!!!    Had to pay to have Upholstry guy pull out two layers temperfoam so my head wouldnt hit ceiling.  Not too smart!!!!  (Copilot is happy, tho.)

If you plan on adding an armrest between L-IV seats, measure carefully because after seats are upholstered, there isnt as much room between seats as you might think.  Bill Hogarty