I have a set of signature recurve limbs, marked 57# @ 28", only thing is they are 60" I bought them new and they have been used very little.
I have 2 different BobLee risers and have 2 differnt sets of BobLee longbow limbs that did not come with either riser, I have traded those sets back and forth on the 2 risers and also have had the recurve limbs listed above on those same risers with never a problem with any of the combonations as far as fit goes, I don't think you will have a problem at all getting a set of limbs and using them with your riser.