Some help identifying some hubs I just got.

[RMesbah]

So I just bought a couple of akront alloy rims for a cb350 project and they came with these hubs. The front one is f-ing huge, clocking in at 228mm. Both of these hubs came without their brake plates and I would like to figure out what they are and if I can acquire the brake plates for them. The seller said he thought they where Montesa Impala racing hubs but I can't find any info on them online. The reinforcement ribs are relatively distinct and I'm hoping one of you has see these hubs before and can point me in the right direction.

 

[crazypj]

I've seen a lot of stuff but never those hubs
The front is going to have a cover plate so I guess that dates them from mid 50's to mid 60's?
Good luck with finding out what they came off 8)