Just something to share.
I went out to a LDS (an official sole distributor of Suunto products) looking to buy a SK7 compass for the DSS boot I bought. Was hoping that I could simply buy the compass capsule (liquid filled compass), the bezel, and the friction rings without having to spend the extra money for a wrist mount just to take those parts out. Luckily, the shop do sell them separately. I understood that they are parts the shop uses for replacements when customer have their gauge sent for service. This save 40% (from the retail price of the standard wrist mount) and not having to worry about disassembling the parts.
So if any of you are looking to get the parts just for the DSS boots, don't hesitate to check with your LDS for the various parts.