leaking injection pump

[BFR]

I have recently developed a leak from my injection pump. The truck is running great, just leaking (the area I colored yellow below). Has anyone used the gasket kit saturn has on their site? Thoughts?

 

[cranetruck]

I have Joel. The hydraulic head uses two large o-rings for sealing.
When Jason and I worked on the pump we replaced these O-rings, they tend to get stiff in time.
To replace, you have to remove the steel fuel lines, the fuel shut-off mechanism, the return and feed fuel lines. Could take a while the first time.
Four clamps hold the head in place. before lifting it out, the gear tooth marked red has to be lined up with a pointer visible when the shut-off mechanism is removed. Turn engine over for this.