For the first fireplace, our Dante Combination Log Lighter & Universal Mixer - 17" - Propane
will work well. Dante manufactures a quality product and the multiple taps on the air mixer can accommodate different supply pipe orientations.
For the second fireplace, a refractory log set with a basic manual pilot will work. Such an option is the Real Fyre 16" Golden Oak Vented Propane Gas Logs Set with Safety Pilot Kit
. This set is technically 1 inch over size for your application, but it can be brought forward in the fireplace opening slightly to accommodate the difference.