Seat belts for modified?

[harrypotter]

What is ‘MSUK Approval’ standard. 
 

I have 4 point but they are not fia standard. Not sure if they are MSUK Approved. 

Where is the best place to buy 4 point and/or 6 point?

 

And what should I be looking for to fit a Westfield. (I know 6 point is better) 

 

Thanks

[Flying Carrot Steve]

https://www.cobraseatsshop.co.uk/westfield-harnesses-326-c.asp

[Flying Carrot Steve]

 

These are what I'm going for.  I think many people here have them.

 

After 12 years of kit car experience I'd say to go for the better Superlite or Ultralite adjusters if you can run to the expense as in kits getting the standard ones to slide easily can be a nightmare. 

 

https://www.cobraseatsshop.co.uk/trs-westfield-pro-6-point-fiaroad-harness-4949-p.asp