One is a trick flow sells for 200.00 will take 100.00 and one is a D.S.S. which sellsm for over 400.00 will take 250.00 . the d.s.s. will probably take the larger
strokes, both have all the parts they come with. The d.ss. is clearence for a
titan pump.Thetrick flow is steel with bolts and the D.S.S. is billet aluminum.