Spare Tire Lock for 1995 Chevy Blazer

Ok guys, I need some help out there. I have a 95 Chevy blazer, 4d 4wd. I have had 2 brand new never off the ground spare tires stolen from underneath. My ex bought a lock after the first was stolen and I was rearended and had my bumper replaced; that's how tire #2 got stolen. Can any of you recommend a spare tire lock that fits my truck? I've been searching online and can't seem to find one that fits my year truck. Also... just reading some of the posts about some of the problems you are having... I have been fortunate. My runs great, just replacements for things worn out. Thanks for looking!!