I just checked my paper work, Im pretty sure mine are 104 hd (heavy duty). It uses a 3/16" wire strut. I think that 700 series would be better though. I order my retracts straight from spring-air. Good people to deal with and sometimes you can get them cheaper buying direct from him. Nobody carries them anymore locally here. I once ordered the wrong retracts for a GS TF P-47. He said just send them back and he sent me the right ones. Took a couple of weeks. I'm never in a hurry when I mail order. Heres their web site with some prices, http://www.retracts.com/
Edwin