Where to check date codes for distributor?

Cougar Community Classic Cougar Maintenance Restoration and Repair
1

I found a distributor on eBay, D0 12207 for 1970 351C for the convertible- but I want to verify the 9MR date code. I checked mustangtek but didn’t see anything. But I am trying to do research on my phone which is not convenient

2

The date codes are:
9= the year of manufacture ( i.e.: 9 = 1969 ),
M= the month of assembly ( i.e.: M= 12th month; December, where the letter “I” is not used ). If that part is assembled into a second year, then the letters N through Z are used ( not using the letter “O” ).
The last digit(s) would be the actual date within the month of assembly. So what you are ‘reading’ as an “R” is probably a 13, for the 13th day of December, 1969.
Hope this helps.

3

Thanks very much! So this would be considered close enough for an April 1970 build, right?