Keith,
I found a closer match to the size required for the radiator insulators.
Just received them after a 3 week wait for the post.
According to Nolathane's own technical info they can be machined to fit other applications. They give tool angles and feeds required on a data sheet. I just have to turn down the collar that fits through the radiator mounting holes.
Working on a mandrel to hold it in the lathe. Will see how it all goes.
On a completely different subject: I posted the attached photos on another site which may be of interest.
Yesterday I painted the headlight buckets a close match to the original reddish brown primer. They had been in just red primer for a long time.
Looking at available colours in aerosols of many brands, the closest match I could find was Mission Brown by White Knight paints sold at good old Bunnings. Although it was in gloss, a coat of clear satin took away a bit of the shine. It may not be a perfect match but it looks better than the red primer and give the buckets a bit of extra protection. Reassembled. last photo.
Cheers,