i always refer to tci products as the bottom of the food chain. most items are crap. the PA is a nice peice, and its the same dia as a "H" code factory servo.
there is a nicer peice avail. billet, anodised larger dia, sealing rings on shaft, gasket & release spring about 120.00 bucks. i think i have 1 in stock, have to check. made by sonnax-same dia as a "C" raito. largest one ever made by ford.
there are other ways to use a stock servo, depending on v-body. i dont recommend it but many modify the stock one for racing.
rich