Yes, I have used them for over 15 years. They are reliable and I have never had a problem with any of my orders.
Note that they are a regional yanmar distributor. Last time I called to place an order, they encouraged me to use a local parts supplier (that they do business with). They gave me the address/contact information for the local supplier. I found it a bit unusual that the local supplier's prices were about 5% LESS than Labourde's prices. Either way, the parts will have to be ordered and it usually takes a week for delivery via UPS.