Bolts to hang 7AFE block on Harbor Freight Stand Options

[Langing]

What bolts do you use to hang 1994 7AFE block on Harbor Freight engine stand?

I just tore down my 7AFE and want to hang its block from my Harbor Freight engine stand. Was told to use the four threaded holes used by the larger transmission bolts, so that is what I am trying to do, but the bolts need to be longer than the xmission bolts and I am having trouble understanding a couple of things.

1) My bolt heads are marked with two slashes which indicates (to me) they are Grade 3 SAE (obsolete) standard bolts. I measured one to be:

(L = 3.0', T = 20 tpi, D = 0.47")

BUT. . . since they have a diameter I measured to be 0.47", and I noticed that 15/32" diameter equals 0.46875" = 11.906 mm

AND. . . the guy at Fastenal showed me that it will easily screw into his 12 mm METRIC hole, suggesting that the bolt is METRIC?

FIRST QUESTION: Is this bolt SAE, as the Grade marks indicate, so did Toyota use SAE bolts in their 1994 7AFE engines, or is it a mismarked METRIC, or something else entirely? Does anyone know what bolt is specified by Toyota.

2) The bolt hole template at Fastenal has a variety of both SAE and METRIC threaded holes. There is no hole even close to the size of this bolt except for the 1/2" hole, and the 1/2" hole is far too big to be the correct size of this bolt. On the other hand, this bolt screws easily into the 12 mm hole of that template. I think it was slightly loose, but otherwise seemed to fit perfectly.

SECOND QUESTION: If I tried to use a 12 mm bolt with the same threads (very fine machine) as an equivalent to the bolt in question, and it happened to actually be SAE, would it not be 'slightly' different than the original bolt, and if so, would tighting the metric bolt into the SAE hole somehow screw up the threads?

3) The guy at Fastenal said to me that he did not have a bolt of even the same length as the 12 mm (SAE) bolt, the original one taken out of my engine (3.0"). The length of his bolts are all less than 3.0". Therefore, I surely cannot get one from them that is 3.5" (the length I actually need to make the engine stand work)

THIRD QUESTION: Where can I get a 3.5" bolt with 20 threads per inch (or 1.25 mm per thread) that is 0.47" in diameter?

The only thing left to say that has any possibility of relating to my problem is that several years ago I had the clutch replaced, which required separation of the engine and transmission. There is a possibility that during that operation the bolt was switched. I am saying this because their failure to replace two of three fasteners in the passenger side motor mount caused the motor to give way and drop almost 2 inches subsequent to the operation, and that is why I have never let another auto technician touch my Celica.

I am perplexed. . .