TS 4 cylinder.
Developed a small leak that appears to be coming from between the brake reservoir tank and master cylinder body.
Does that sound like perished reservoir seals/grommets??
Can you buy them on their own?
Is it a simple remove reservoir tank/replace seals/reinstall reservoir tank/bleed system??

PBR do a full master cylinder seal kit. The website lists several part numbers, so it might be a good idea to call them and find out exactly what you'd be getting.

It's fairly easy to remove - the fluid level sensor, and the 4 brake lines. After they're off, you can unbolt the master cylinder from the firewall. If you're going to go to the trouble of pulling it out, you may as well overhaul it.