I have purchased several disc brake setups for Ray (just ordered three more sets in fact) and have found him a great person to work with. Great product, wonderful support, etc.
He's only planning on being in the US for a few months before he heads back to Thailand (his wife is from there and they moved from Oregon to Thailand a couple years ago so that she be be close to her mother after years of being in the US...) so now is the time to contact him if you need anything or have questions.
I'll be installing a dual MC in the next week as part of my XM708 refurbishment and am halfway through instaling the discs. I have them both (dual MC and four wheel discs) on my Cummins powered M37. If you can't get in touch with Ray at Helitool/Uglytruckling for some reason, ask here and I'll try to help.