Just found these may be of interest to some

App for selecting seals
https://itunes.apple.com/us/app/bike-seals/id564266378?mt=8

You are here: Shop : SKF : SKF Fork SealsSKF Fork Seals Kit (KIT50M)SKF has introduced a new range of fork seal kits specifically developed for heavy-duty off road use. This new generation of fork seal kit is optimized to enhance the protection with a dual lip dirt scraper design that creates a labyrinth to limit the exposure of the oil seals to mud to further safeguard the fork setting from losing his performances after short riding time.To find the correct Fork Seal kit for your bike model, please refer to the fitting guide.

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  • $50.00
  • $50.00
  • In Stock: 12
  • Qty
  Suitable for the following models:MARZOCCHI 50mm
  • WR all 2007+ CRTC all 2006+
  • BETA RR 4T ALL MODEL RACING 2005+
  • TM EN SM MX 2007+
  • MVAUGUSTA F4 (marzocchi); BRUTALE (marzocchi)
    
  Comes with an oil and dust seal in each SKF Fork Seals kit.SKF Benefits
  • Reduced and constant friction – reduction of over 20%
  • Improved feel and smoothness
  • Compatibility with a wide range of OE and aftermarket oils
  • Increased life and performance
  • Enhanced water and dirt protection capability
  • Reduced wear and air suction
  Please Note: When ordering 2 kits are normally needed per bike.

  I have been using them for a few years, swear by them, its the only seal that works on my 50mm Marzocchi forks, check out  skf wheel bearing seals as well, they don't turn on the wheel spacer but in the seal its self, last longer and seal way better than OEM seals.

www.jwtimports.com.au/products/skf/wheel-seal/