OP, are you asking to replace the sliders with something else, or are you asking to have LARGER sliders installed where the existing sliders are located, I think there is some misunderstanding. Making the hole larger is a much bigger project requiring new header (or lintel beam) probably moving the wiring, permits, ARC approvals, and a LOT of dust and noise.
T&D is the normal go to company for this type of work, but they will usually have a long wait time, I have seen several other recommendations on this site, but do not recall the companies.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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