I know exactly what you're talking about, but I don't know the exact name of it. Regardless, it's a latch. I just sold a guy one the other day because his new coach didn't come with the spring. The kit is only available with two complete replacement latches, so you just can't get whatever part broke.
I'll do some searching around for the official name.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR