Hi Kit,
I never had to replace one yet, but this may help. Scroll down to "
DELUXE 5/8" COMPARTMENT THUMB LOCK"
JR Products :: Catalog
The key to searching is what they call the thing... Doing a hit on Amazon under "JR Compartment door thumb locks" turns up many
You will need to figure out if you need a 5/8" long or 7/8" . I think the 5/8 may be more what you might need as the Sunline cargo doors are not that thick. There is a link on the JR web site for more info. It fires an email and I'm assuming they send you something.
I do not know if the diameter of these newer ones matches your older camper. They may. This is where more info on the dimensions of the old latch and the new ones being sold to compare will confirm you are getting the correct one.
Tweetys has some too.
Tweetys.com - RV Parts & Accessories - RV Hitches - Search I have bought from them before and have had a good experience.
Hope this helps
John
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club