Oil pump standpipe lengths

I would like to know the exact lengths of the two standpipes used in production slant oil pumps before and after the changeover date in the early 70's from the long to the short.

The parts book says the changeover date was for the 1971 model year. A TSB issued 2-23-72 refers to short oil filter able to be used on 170,198,225 engines built prior to 1971 if the standpipe is changed to the short version. I have a '71 and '72 engine with same length standpipes.

Please, no random posts about best oil filters, best oil, things you thought you remembered. The two measurements will be appreciated.

Thanks.