Diamond pattern chains for that 27x8.5-15 seem to be tough to find. I wonder if 27x9-14 chains would fit? There are several options I see out there for that size. Some are alloy studded chains.
Wesco has several options for 27x9-14 chains
Others probably do as well.
Some of these studded chains have a fairly high profile. If you are using them on front wheels, you'll want to check the clearance carefully, especially with the wheels fully turned. If clearance is a concern, the square link diamond pattern chains have a lower profile but still have pretty good traction (they are also claimed to be friendlier to pavement).