to allow 1500 byte packets to be sent across the tunnel, you will either have to:
1) increase the MTU of the WAN interfaces (apparently not possible here)
2) You can also try to configure "tunnel path-mtu-discovery" under the tunnel interfaces and let them find the best MTU based on the path they cross or decrease the mpls mtu. Though, if you the tunnel MTU is decreased, that means fragmentation will occur. If applications are using the df-bit, you will then need to clear the df-bit for each packets entering the router.
Which router/module/interface are you using here ?
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