You have a Wells-Gardner model 25K7111 which is really a model 25K7191 circuit board mounted to the wooden bottom instead of a metal bottom. See this link:
www.jstookey.com/arcade/WG_25k7191/Any one of these complete main circuit board with neck board and remote adjustment boards (where applicable) will work:
25K7191 (uses P485 long remote adjust board)
25K7193 (uses P632 remote adjustment board)
25K7194 (uses the P632 remote adjustment board)
25K7197 (uses the P632 remote adjustment board)
Be advised that early runs of the 7191 and 7193 did not use a remote adjustment board. All the white trimpots were located on the main monitor board. All versions use the standard K7000 series capkits available from both Zanen Electronics and Bob Roberts. All 25K71xx have "P538" silkscreened on the main board component side. They require the use of an isolation transformer.
This info should help you locate a good used working chassis on ebay. If you are unable to find a chassis for this monitor you can always buy the "8liners.com" chassis so well discussed here on this forum. You'd want to order the 25", 10 pin, low impedance replacement chassis ($95) if you go that route.