SES in Bolton machined some for me, I think the ones they started with were from an allegro and they accept Sierra valve stem oil seals which the original HS ones don't have. They did all the fitting of the valve guides too. Family run buisness, very pleasant to deal with.

SES Ltd
1 Nile Street
BOLTON
BL3 6BW

01204 362777

www.fixmyengine.co.uk