XYZ Extremes plastic Gaurds are as close to NOS as you'll get, I ordered a set of white front and rear gaurds for a 1974 YZB and were delivered in about a week, perfectly moulded, correct lines & got the right gloss finish, which was what I've been tryin to find for a furk'n long time,Very impressed with em, DC plastics are ok for a race bike but these are a cut above.
I tried Les first at VMX Unlimited ,top bloke and very helpfull ,I think i got the last rear that they had , which is also good ,but supplies of fronts have dried up.