Next day checked the seal ends they were glued together. Reassembled retainer letting it self locate. Then used syringe with 4" blunt tip needle to inject Ultra grey down into upper portion of Oring grooves. It was a [censored] to get the RTV to come out the needle end which is why needed to use handle on the syringe. Once i see RTV ooze out watching near #5 cap, then I know it is filled. I filled the top half inch with long needle then switched to short needle for the lower part of the groove. Short needle RTV comes out way easier.

In picture you can see grey RTV between block and aluminum retainer, filled by syringe thru o ring groove from below.