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I got back from Gibson's after getting those grommets. There were 5-6 Reattas and a couple of Rivs with the Teves brake system. I only got one set of grommets as I just couldn't see taking apart a Teves unit [and then probably ruining it] just for some rubber grommets. So I went to the local Buick dealer and tried to order these grommets. As you might guess they are discontinued, however there is one GM repair kit left in the country that includes the grommets so I bought it. I'll just add it to my other parts that I may never need, but if I do, I'll be all set.

Here is the 91 Starter and Charging System. A service manual is a an extremely valuable tool for these cars if you are going to do the work yourseld.

I was wanting you to do that because if the lights went out when you turned the key it would mean you had a bad connection to the battery. Since your lights don't dim or go out that tells me there is a problem in the circuit that activates the starter. I hesitate to offer to much help on a '91 because there a lot of differences from earlier models and I've never worked on a '91. From what I've read here so far, your problem could be the theft deterrent system locking out the starter, a bad ignition switch or park/neutral safety switch as 2seater said. Below is the path (yellow) the circuit takes if your '91 is like earlier models. Note the starter interrupt relay in the circuit. It is what keeps the starter from turning if the VATS is the reason it won't start. Assuming the '91 is same as other models, I would do my troubleshooting at the transaxle position switch to determine if the starter is the problem or the other things mentioned.

2 seater tells me all the time that I am the guy that learns first the quirks the Reatta develops because of the miles I have on the Red [329,xxx of today]. Well today I learned another new thing. The plastic Teves reservoir is held in place with rubber grommets on two points on the top of the Master Cylinder. These grommets are also seals to keep the brake fluid from leaking onto the MC and then onto the ground. I went to Kendalls with my back up Teves MC and we compared the replacement units grommets to the original one on the car. The replacement unit grommets were soft and pliable, the original unit grommets were hard and cracked. So we swapped the grommets, saving me swapping out the entire Teves unit. Later this week I will be going to Gibson's the local You Pick yard for more grommets. One pair to make my back up complete again and another pair for "just in case".