FOT installed a residential side by side unit for us recently. It is a Frigidaire 22.6 c.f. counter depth model and David's crew did a great job with the installation - it looks wonderful in the coach. The width is very close to the original Dometic unit - we lost the bottom cabinet but these rigs have so much storage in them who cares! The water/ice dispenser in the door is very handy and does not stick out in the hallway.
Shop Frigidaire Gallery 22.6 cu ft Side-by-Side Counter-Depth Refrigerator (http://www.lowes.com/pd_330225-2251-LGHC2342LF_4294857967__?productId=3203183&Ns=p_product_avg_rating|1)
We also replaced the Microphor toilet. Never did like it very much as it was too low and the parts are hideously expensive - the "hopper" needed replacing ($800 just for the parts) so we put in an electric flush Thetford Aria Deluxe II that is much taller, has a switchable water mode for dry camping, and only costs $600. The base is narrower than the Microphor but Ricky filled in the holes in the ceramic tile with a perfect color match.
http://www.thetford.com/Home/Products/PermanentToilets/AriaDeluxeII/tabid/82/Default.aspx (http://www.thetford.com/Home/Products/PermanentToilets/AriaDeluxeII/tabid/82/Default.aspx)