Thanks, Richard. I had already ordered Dorman 23733 Water Pump Stud Kit from Walmart. The retainer cap end is 5/16-18 x 7/16 and the pan end is 5/16-24 x 5/8. OAL is 1 1/4. It hasn't arrived yet, but I guess it will do. 

Blackie,
I had ordered an assortment of  studs. 7/8 1 1/4  1 1/2. I can return the ones I don’t use.  

Blackie,
I had ordered an assortment of  studs. 7/8 1 1/4  1 1/2. I can return the ones I don’t use.  

OPPs it was 9l16 lower and 7/8 upper in length
they also have 3/4
my search was 5/16 double ended stud 

I just went to Amazon's site and searched 5/16-18 x 3/4 and found nothing that size. Is 3/4ths long enough?

Got 3/4 on Amazon

The studs are 5/16-18 on the retainer cap and 5/16-24 at the oil pan. Ted said that the overall length of the original studs is 7/8ths; however, the shortest studs I could find have an OAL of 1 1/4. 

Found em on amazon

Looking at the crank to flywheel section.  I see no oil dripping. So oil leak is not there. After reading Ted’s statement I did not use studs in.