What thin wall, black tubing to replace from chain oil tank to chain pump - Z1?

1/4" I.D., 1/16" wall thickness, barb compatible.

OEM # 92059-071 (superseded by 92059-072). Prices on NOS are in the nosebleed category.

Needs oil and heat resistance.  Want to keep the semigloss appearance as close to original as possible.

We've seen vinyl, polyurethane, Buna-N and Viton available.  Personal experience with any?

Bulk (20 - 25 ft.) or by the foot would be fine, as we're replacing chain oil tubing on four Z1's / Z1-A's.

Thanks for suggestions.

Good Ridin'
slmjim & Z1BEBE

Grainger might have something that will work: www.grainger.com/search/pipe-hose-tube-f...utomotive-fuel-hoses

They have 25ft and 50ft rolls, but the wall appears to be thicker than you want (roughly 1/8" vs 1/16").

In the UK but carry more than is on the website and have stock of just about everything that's available. 
www.advancedfluidsolutions.co.uk/petrol-...-fuel-hoses-89-c.asp

  Thanks for the responses, everyone.
  We've browsed McMaster-Carr for prospects too. The tools on it's site make it easy to filter by many parameters.  It's very promising, but we might have to modify the dimension specs. 
  The tubing on our Z1's and Z1-A's have all changed over time, becoming somewhat brittle & stiff, shrunk a little, and tending to weep at the oil pump barbs.  We broke down & ordered a length of PN# 92059-072 from Mama Kaw.  We'll mic that & see if bulk that is available from vendors will match, although prices are comparable per foot to what Mama Kaw gets.
   We probably erred on precise dimensions in the OP.  Saw a response to the same question on fakebuuk that was pretty specific on dimensions.  We'll see how closely that matches when the new OEM tubing arrives & we mic it.

Good Ridin'
slmjim & Z1BEBE

I love this stuff :

www.mooseracing.com/products/547801/productGroup/382493

1/4" ID 1/16" wall, gloss black polyurethane, won't crack, shrink, rot, or swell. On the correct size nipple you don't even need a clamp!