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Marder III Ausf. H, Sd.Kfz. 138
This variant of the Marder III fielded the standard 7.5 cm Pak 40 German anti-tank gun on a slightly modified Panzer 38(t) Ausf. H chassis. This chassis still had the engine in the rear of the vehicle but, unlike the previous model, this vehicle utilized the fighting compartment of the Panzer 38 in the center. This allowed the crew to stay low in the center of the vehicle, lowering their exposure to small arms fire and shell fragments. But, because of the rear-mounted engine, there was only enough room for two men to stand in the center. Large side armor gave additional protection for the crew. However, the thin horseshoe shaped armor only protected the front and sides; the rear and the top were exposed. Thirty-eight rounds of ammunition for the gun were carried. As with the Sd.Kfz.139, this vehicle also carried a Czech manufactured 7.92 mm machine gun in the hull.

The full name of the Ausf. H was the 7.5 cm PaK 40/3 auf Panzerkampfwagen 38(t) Ausf. H, Sd.Kfz. 138. A total of 275 vehicles were built in two series from November 1942 to April 1943. An additional 175 vehicles were converted from Panzer 38(t)'s in 1943. Chassis numbers of new vehicles were 1751–2075 and 2121–2147 (overlapping with simultaneous Grille production).
https://en.wikipedia.org/wiki/Marder_III