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Are these HWH flip down jacks? And I don't recommend customer's do this job themselves. It can be dangerous! One of our techs here just about lost his thumb doing these, and he had experience. I would enlist the help of a shop or mobile tech who has done these and has the proper tools. It might save you more than just a few bucks. In any event, and that being said, get back to me with this information on the jacks and I can get you the part number. They do have to be HWH made springs and come from HWH. You can buy them directly from them if your dealer isn't set up with them for parts.
I am attaching a link to the parts for these IF you have the flip down jacks. IF NOT, let me know. http://www.hannarv.com/P/HWHR6824HydraulicRVJackReplacementSpringKit/18973
Notice, that they go by the number of coils of your OEM springs.........they come in different lengths for the various models.
IF you have straight acting jacks they list those as well. The correct jacks number should be printed on a label on the jacks and begins with "AP" and a part number. See the attached link...........http://www.hannarv.com/rvTrailerQuestions/WhichHWHSpringKitistherightone