Axel spacing for MorRyde SRE 4000

Hope somebody cam measure their axel spacing for me. I am ordering the MorRyde SRE 4000 suspension upgrade with heavy duty shackles. The 2 options when ordering from MorRyde are 35" or 33" axel spacing. My 2015 28rks measures just about 34.25" from center to center. Just wondering what somebody else has for a center to center and which option to order if I am measuring 34.25" ?