Reid Supply has many different options for the latches you are looking for. I think they are Destaco or some variant.
How big is the spare you plan on carrying? I ask this because mine broke a few years ago and it was a swing out carrier. Although it was a different design that initially did not have a latch or anything to hold the free side down. I had to modify it after a 39.5" tire went bouncing across the road and it has not been a problem again, although it does not get driven as much as it used to.
Here's a link.
http://www.reidsupply.com/aDetail.aspx?N=1003805&A=TC-374&An=1003805&On=1003805&ST= Similar to what I used but there are other styles. Each style comes in many different sizes so read the specs real well. The first on I ordered was about 10" long and 3" wide.
