Replacement engine for Gehl SL5620

[PovertyPinnacles]

I have a Gehl SL5620 with a Perkins 4.154 that the head is cracked and can't seem to find a new head. Was wondering what engine could replace this engine. Does not have to be another Perkins.

 

[swampbuggy]

I have the same issue. No head for a 4.154. which Kubota will swap into this 6625?