Thanks for the help on here. Now that I know my current condenser is not a parallel flow unit I need to know the size. I contacted ackits.com and they said there are 2 ways.
1. Measure ( which is fine but I am not home at the moment and want to order it NOW!)
2. Anyone who ordered one before can pm the invoice # and they will pull it and duplicate one from those specs.
Anyone who has done this on an 85 300SD and has the info handy it would be appreciated. If not I can not get home and measure until I get home late tonight.
Thanks
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )