Rothwell SUT/ which Lundahl's?


Anyone know which Lundahls are used in the Rothwell SUTs? Mainly the MCX model.
Thanks
Tom
tom_hankins
Another option is Kevin Carter @ K&K Audio who is the US distributor for Lundahl. 
slaw, K&K is my other option. If the Rothwell uses the LL1931 it'll save me a few bucks and I like the looks better too.
Couldn't get any info from Rothwell, and dealer didn't know which Lundahls were in the SUT. So, I ordered the K and K premium (LL1931) SUT with 1:8 and 1:16 option.