Hi Dave as you are dealing with an older Lathe you are probably not aware that older machines used a different "pressure angle" it was 14.5 degrees more modern machines used 20 degree pressure angle this slightly altered the dimensions . Most modern day suppliers offer 20 degree but can make 14.5 degree at a much higher cost or even when they have enough orders to do a batch.The gears I have are all 20 degree angle & 14DP which are slightly larger than yours,they are cast iron and are 30 teeth x2,40teeth x1,45teethx2,46teethx2,55teethx1,and65 teeth x1 .They are .500" wide ,5/8 " bore and most come with driving pins making for easier compounding.I live in North East England(Northumberland) about 16 miles from Newcastle on Tyne.The cost of these gears if any use to you would be £70.00. I can arrange carraige extra at about £ 15.Please let me know ASAP as another modeller is also interested.Thanks Ernie