Need some guidance on the rear shock, please.
Looking to stay around 250ish and am having a hard time finding 165*42.5 shocks.
Fox Performance 165 x 42.5 Shock Trunnion Dps Float, does that fit? This frame needs trunnion mount right?

Any other suggestions? I was looking for the rs from the giant trance people were buying but the only rs options I can find are over 400 bucks.

Wow, everyone, thanks for the detailed responses.

To answer the questions,
Height= 179 CM (5'10.5") without shoes 180 CM (5'11.25") with shoes

My inseam is 33.25" (84.5 cm) with shoes / and 32.5" (82.5CM) without shoes

WingSpan Tip to tip is 73.75 inches/ 6' 1.25"    (187cm)

Reach from armpit to fingertip is 29 1/8"(73.75 cm)

Type of riding

This will be an all-in-one bike (I know there will be compromises) Currently I road ride a 90's road bike- nothing special and a 1995 proflex.

I will want this bike to replace both (I ordered two sets of rims, one with slick street tires and one with MTB tires to swap) and front and rear will have lockouts.

33% trail- I live in the northeast in Rockport, there is no such thing as a fast flowy trail unless it is man-made. Super technical, rocks, roots, ups, downs, drops.

33% gravel/ dirt bike path type stuff with family and friends

33% road riding. I like to ride my bike to work a couple of days a week. It's about 10 miles each way.

Sizing Question
I am 179 CM (5'10.5") and fall right on the line for a M/L. What would you guys suggest? I am coming off a 1995  26' Proflex 855 size large- so zero experience  with the modern GEO.