So I lowered my car and am researching rear shocks.
Here is what I found.
First, The COBRA IRS shocks are a good option, and you can find replacements from Tokico now.
are the listing I found for the Cobra IRS.
8041 1270Sport Is their answer for the IRS Cobra. $150 a piece approx.
For the Thunderbird applications:
Monroes, you can get the shocks for the 89-91 cars and they will have a shorter compressed length. Useful for lowered cars.
#5950 is the Sensatrac unit.
Otherwise, the stock height ones are #5965.
Pep Boys, Checker
69820 Is the Ultra for 98-91 cars, expected to be shorter compressed length. It has a high gas pressure. One of the best low priced shocks around.
Tokico Blue for the Bird
I think these are the best shock you can get for less than $70 each. This shock is good for lowered cars also.
8041 1202Sport are adjustable and the best shock for you tweekers. At about $135 each they should be. This may be a good shock for lowered cars too.
I have never heard good things about KYB GR2 so I will not visit those parts.