Transmission Mount Insulator Spacers

[archangel]

I am preparing to reinstall my 727 back into my 1970 Super Bee w/383HP. I had pulled the trans many decades ago. My parts bag with the original (factory?) insulator and bolts did not have any spacers. It is very possible that the previous owner might had been monkeying around with the trans and lost or chose not to reinstall spacers.

Not being a transmission guy my research has left me a bunch of unanswered questions.

In the context of striving to be factory correct:

-Am I correct in thinking that the block style insulator w/o spacers is correct for my car or should I use spacers?
-Which carlines used the block vs spool type insulators?
-Did all spool type insulators use spacers?
-Why were spacers used in the first place? I believe that they were intended to be installed between the mount and the bolt head (as opposed to between the mount and the trans) so were they used as a nut plate to spread the force and/or reinforce the area?
-Why do some spacers have offset vs centered holes? I have factory examples of both types. 727 vs 904?

Yeah, I know, a lot of questions about 2 small pieces of steel!

Sample pictures, the first borrowed this forum.

 

[PurpleBeeper]

Aren’t those “square washers” and not really “spacers”? I thought they went under the bolts, but over the trans mount

 

[archangel]

I agree with you, "under the bolts, but over the trans mount". I used the term spacers because that is what they are referred to in Dave Wise's (MMC Detroit) restoration book. The parts manual is a bit confusing to me. Maybe they are called "spacer" or maybe called "nut, plate bolt".

If in fact they are referred to as spacers, which is my guess, then there is no part number for a '70 Super Bee (W carline). This reinforces my thought that my car should not use them.

If they are really "nut, plate bolts" then a part number is shown for my car. The 383 column is 3rd from the right.