Hello. I have a Genie GCG350ML and need the carriage assembly and open/close limiters. Are these open/close limiters universal from any other models? Seems like it would just be a signal sent via the wire to the board when the switch is tripped? And also the carriage assembly for this is hard to find, even on eBay. Will any others work for this (I already have the inner slide part that is in the rail). Thanks in advance!