NAICS and SICs

Question

(1) Is the 1991 industry data is available at the CSD level by 1997 NAICS codes
(2) Is the 2001 industry data is available at the CSD level by 1980 SIC codes

I had a look at the information on this webpage and the following paragraph makes me think that it's probably "not available" for Question #1 (although it does suggest the workaround of using the LFS data) and "possibly available" for Question #2. Therefore, if "possibly available" - where might that be accessed and hopefully it's not a custom order?

Hence, we can conclude that the conversion to NAICS97 in 2001 will cause a break in the census time series. To accommodate the data requirements of users of historical census data, the 2001 industry write-in responses were coded separately to the NAICS97 and the SIC80. Since the census does not plan to undertake any historical reconstruction of previously released data, it is recommended that comparable data -- such as data from the Labour Force Survey -- be used as a proxy for NAICS97-based distributions of census labour force data prior to 2001.

Answer

Neither 1 or 2 are possible through the DLI according to the Census Help Desk. The only real alternative is to have 1980 SIC by CSD for 2001, but this would be at a cost.